Latent syphilis is a stage of syphilis where the infection is still in the body but there are no noticeable symptoms. It often lasts for months or years, and many people with latent syphilis only learn they have it after a blood test or during routine screening, including testing for latent syphilis in pregnancy. Latent syphilis can affect adults of any age, and it matters especially in pregnancy because the infection can pass to the baby. If it is not treated, latent syphilis can later damage the brain, nerves, eyes, heart, or other organs, and in severe cases it can become life-threatening. It may help to know that doctors have studied this condition for decades, and treatment with penicillin usually works very well.
How many people live with Latent syphilis?
Worldwide, about 19.9 million people ages 15 to 49 were living with syphilis in 2022 (World Health Organization, 2024), but no single widely used source gives a separate global count for latent syphilis alone. In the United States, 209,253 syphilis cases of all stages were reported in 2023 (Centers for Disease Control and Prevention, 2024), but a reliable national estimate of how many people are living specifically with latent syphilis is not consistently reported.
Overview
Latent syphilisSymptoms
Latent syphilis usually causes no symptoms, so many people feel completely well. Even without signs, the infection remains in the body and can later lead to serious problems if it is not treated.
Outlook and prognosis
With latent syphilis, many people feel well, but the infection can still harm the brain, nerves, eyes, or heart over time. The outlook is usually very good when treatment happens early and follow-up blood tests show the infection is clearing.
Causes and risk factors
Latent syphilis is caused by infection with the syphilis bacteria, usually after earlier syphilis was missed or not fully treated. Risk is higher with unprotected sex, multiple partners, a partner with syphilis, HIV, and limited access to testing or care.
Genetic influences
Genetics usually are not a major driver of latent syphilis. Small differences in immune-related genes may slightly affect how the body handles infection, but exposure, testing, and treatment matter far more than inherited genetic variation.
Diagnosis
Latent syphilis is diagnosed with blood tests, usually after a positive screening test is confirmed by a second test. Doctors also review past symptoms, sexual history, and prior treatment to help confirm the diagnosis of latent syphilis.
Treatment and drugs
Latent syphilis is usually treated with penicillin shots. Early latent infection often needs one dose, while late latent syphilis usually needs weekly shots for 3 weeks. Follow-up blood tests check that treatment worked.
Symptoms
Many people with latent syphilis feel completely well and do not notice anything unusual. If you are searching for early symptoms of latent syphilis, the key point is that this stage usually causes none. It is often found only through a blood test, sometimes during routine screening, pregnancy care, or follow-up after a past syphilis infection.
Latent syphilis usually causes no pain, sores, rash, fever, or other noticeable problems. Many living with latent syphilis learn they have it only after a blood test.
Some people diagnosed with latent syphilis remember a painless sore, a body rash, swollen glands, or patchy hair loss from an earlier stage of syphilis. Others never noticed those changes, and those past symptoms are not part of the latent stage itself.
If latent syphilis is not treated, it can eventually lead to symptoms affecting the brain, nerves, eyes, or heart. These problems belong to late syphilis rather than the latent phase, which is why treatment matters even when you feel fine.
How people usually first notice Latent syphilis?
Latent syphilis is usually not noticed because this stage has no obvious symptoms, so many people only learn they have it after a blood test done during routine screening, pregnancy care, STI testing, or an evaluation after a partner is diagnosed. In many cases, the first signs of latent syphilis happened earlier and then faded, such as a painless sore, a rash on the palms or soles, swollen lymph nodes, fever, or patchy hair loss, which can make it seem as if the infection went away when it did not. That is why latent syphilis is often first recognized through testing rather than how you feel, and early treatment can prevent serious complications later on.
Types of Latent syphilis
Latent syphilis means the infection is still present, but there are no noticeable symptoms at that time. The main types of latent syphilis are based on how long ago the infection likely started, because that affects how easily it may spread and how doctors manage follow-up. Not everyone will experience every type.
Early latent
This means the infection was likely acquired within the past 12 months. People with early latent syphilis usually feel completely well, but blood tests are positive and the infection may still be more likely to spread through sexual contact than in later stages. Sometimes there is a recent history of a sore or rash that has already gone away.
Late latent
This means the infection has probably been present for more than 12 months. There are still no active symptoms in late latent syphilis, but the infection remains in the body and can cause serious health problems years later if it is not treated.
Unknown duration
This is used when the exact timing of infection is unclear, which is common if earlier symptoms were mild or missed. In practice, doctors usually manage this like late latent syphilis because the safest approach is to assume the infection has been present for longer.
Can I slow down the onset of symptoms?
Usually, no lifestyle change has been shown to meaningfully delay symptoms once syphilis has entered its hidden stage, called latent syphilis; the main way to reduce the chance of future symptoms is prompt antibiotic treatment. Well-established guidelines recommend treatment, usually with penicillin, along with follow-up blood tests to make sure the infection has been controlled; safer sex and partner testing can help prevent passing it on or getting it again, but they do not treat the infection already in your body. Getting treated early can greatly lower the risk of later problems, although no step can promise that future symptoms will never happen.
What genetics can tell you about symptoms
For people with latent syphilis, genetics usually cannot tell you much about symptoms because this stage, by definition, causes no noticeable symptoms even though the infection is still present. There is ongoing research into whether small differences in immune-related genes may affect how the body responds to the infection and the chance of later complications, but there are no well-established genetic tests that can predict which symptoms will appear, how severe they will be, or when they might begin. In practice, the stage of infection, whether treatment was received, and overall health matter much more than genetics.
Causes and risk factors
Latent syphilis develops when a syphilis infection is not found or not fully treated, and the bacteria stay in the body after the early stage. The main risk factors for latent syphilis are sex without condoms, having more than one sexual partner, and having sex with someone who has syphilis. Risk is also higher in people living with HIV and in communities where syphilis is more common. Limited access to testing and treatment can make it easier for syphilis to go unnoticed and become latent. Genes and family history are not known to be major drivers, and having risk factors doesn’t mean you’ll definitely develop the condition.
What are the most common causes or risk factors?
Latent syphilis happens when syphilis, a sexually transmitted infection caused by bacteria, stays in the body after an earlier infection and is not treated. The main risk factors are having vaginal, anal, or oral sex without condoms, having more than one sexual partner, having a partner with syphilis, and not getting tested or treated early. Risk is also higher in people living with HIV, men who have sex with men, and during pregnancy, because the infection can pass from a pregnant person to the baby.
Environmental and biological risk factors
Latent syphilis is a stage of syphilis where the infection is still in the body but there are no clear symptoms. Doctors often group risks into internal (biological) and external (environmental). For latent syphilis, the biggest risks are being exposed to the bacteria and not having the earlier infection noticed or treated.
Direct contact with a syphilis sore or rash during vaginal, anal, or oral sex is the main way the infection spreads. If the earlier infection is not recognized and treated, it can later show up as latent syphilis.
Living in a community or social network where syphilis is more common raises the chance that an exposure involves the bacteria. This can increase risk even when someone does not know a partner is infected.
When testing, prenatal care, or sexual health services are hard to access, early syphilis is more likely to be missed. That makes it more likely the infection will only be found after it has entered the latent stage.
Early sores can be painless and easy to miss, and a rash may be faint or mistaken for something else. When the early symptoms of syphilis are overlooked, the infection can move into the latent phase without warning.
Genetic risk factors
For many living with latent syphilis, it is natural to wonder whether genes play a part. There is no known inherited gene change that causes latent syphilis, and there are no proven genetic risk factors for latent syphilis used in routine medical care. At present, genetic testing does not help diagnose latent syphilis or predict who will develop the latent stage after infection. Research is ongoing into immune-system differences, but these findings are not established enough to guide care.
Inherited cause: Latent syphilis is not known to be caused by a gene change passed down in families. It develops after infection with the syphilis bacterium, not from an inherited disorder.
Family history: Having relatives with syphilis does not by itself mean you have a genetic tendency to latent syphilis. Doctors do not use family history as a genetic risk marker for this stage of the illness.
Immune genes: Researchers have studied whether small DNA differences in immune-system genes might affect how syphilis behaves in the body. So far, these results are not strong or consistent enough to count as established genetic risk factors.
Genetic testing: There is no standard genetic test that can show whether someone will develop latent syphilis. Diagnosis relies on medical history and blood testing for the infection, not on inherited DNA findings.
Lifestyle risk factors
Latent syphilis often reflects earlier untreated infection, so day-to-day habits mainly affect the chance of acquiring syphilis and delaying diagnosis rather than causing the latent stage by themselves. The main lifestyle risk factors for latent syphilis involve sexual practices, substance use, and patterns of healthcare use. Because latent infection may have no symptoms, habits that reduce testing or treatment can allow infection to persist unnoticed.
Vaginal, anal, or oral sex without condoms or barriers increases the chance of acquiring syphilis. If early infection is missed or untreated, it can later become latent syphilis.
Having multiple or overlapping sexual partners raises exposure to syphilis through a larger sexual network. This can increase the likelihood of infection going unrecognized until it reaches the latent stage.
Alcohol or recreational drug use can impair judgment and make condom use, partner communication, and safer-sex planning less consistent. This can increase exposure risk and make follow-up testing or treatment less likely.
Skipping regular sexual health screening can allow syphilis to remain undetected because latent infection may cause no symptoms. Infrequent testing is one of the most important ways how lifestyle affects latent syphilis.
Risk prevention
Latent syphilis can be prevented mainly by avoiding infection in the first place and by finding and treating syphilis early, before it moves into this silent stage. Because latent syphilis often causes no symptoms, many living with latent syphilis only learn about it through a blood test after a partner is diagnosed or routine screening is done. Prevention works best when combined with regular check-ups.
Using condoms or dental dams during vaginal, anal, and oral sex can lower the chance of catching syphilis. They do not remove risk completely because sores can be outside the area covered.
Routine STI testing is one of the best ways to prevent latent syphilis, especially if you have new or multiple partners. Knowing the early symptoms of syphilis also helps, but testing matters because infection can become silent.
Treating syphilis as soon as it is found can stop it from progressing to latent syphilis. Finishing the full antibiotic treatment and follow-up blood tests helps make sure the infection is cleared.
If a sexual partner has syphilis, getting tested and treated quickly can prevent infection or catch it early. Partners often need care even if they feel completely well.
Can you prevent Latent syphilis?
Not completely, but you can lower the risk a lot. Because latent syphilis is a hidden stage of syphilis with no symptoms, the best way to prevent it is to prevent syphilis in the first place by using condoms, having fewer sexual partners, and getting regular sexual health testing, especially if you have new or multiple partners. If syphilis is found, early treatment can often stop it from reaching this symptom-free stage.
Transmission
Latent syphilis means the infection is still in the body even though there are no symptoms. Many people wonder how latent syphilis spreads: it is usually linked to earlier sexual contact, including vaginal, anal, or oral sex, with someone who had syphilis, but once the infection is truly in the latent stage it is much less contagious than the earlier stages.
Early latent syphilis can sometimes still be passed on, especially if symptoms briefly come back, while late latent syphilis is generally not spread through sex. Latent syphilis can still pass from a pregnant person to the baby during pregnancy, and it is not spread by hugging, sharing toilets, sharing food, or other casual contact.
When to test your genes
For latent syphilis, genetic testing is not used for early detection or to guide treatment. What matters is standard syphilis blood testing, especially if you have a past untreated infection, a sexual partner with syphilis, HIV, pregnancy, or other STI risk factors.
Diagnosis
Latent syphilis often causes no obvious symptoms, so it is usually found through testing rather than how someone feels day to day. Many people feel relief just knowing what’s really going on. The diagnosis of latent syphilis is based on blood test results, a review of past symptoms or treatment, and checking whether there are signs of active infection in the brain, eyes, or other organs.
Doctors use blood tests to look for antibodies linked to syphilis infection. A screening test is usually followed by a second, different blood test to confirm the result and support the diagnosis of latent syphilis.
Doctors ask about past sores, rashes, sexual exposure, pregnancy, and any previous syphilis treatment. This helps tell whether the infection is newly found, recently acquired, or has likely been present for longer.
A physical exam checks for signs that syphilis is active rather than latent, such as a rash, sores, swollen lymph nodes, or nerve problems. If none are found and the blood tests are positive, latent syphilis becomes more likely.
Latent syphilis is classified as early latent or late latent based on when infection most likely happened. Recent negative tests, a known exposure, or symptoms within the past year can help doctors decide the stage.
How is Latent syphilis diagnosed?
Latent syphilis is usually diagnosed when blood tests show a syphilis infection, but there are no current symptoms such as sores, a rash, or other signs seen earlier on. A doctor or clinic will also ask about past symptoms, sexual history, and any previous treatment, and may do an exam to make sure there are no visible signs of active infection. If there are concerns about the eyes, hearing, or nervous system, more tests may be needed to check whether the infection is affecting those areas.
Stages of Latent syphilis
Latent syphilis usually has two recognized stages: early latent and late latent. In this phase, people have no noticeable symptoms, so the staging is based mainly on when the infection was likely caught and what blood tests show. Doctors usually start with a conversation about past symptoms, sexual history, and previous test results to work out how latent syphilis is diagnosed and staged.
Early latent
This means the infection was likely acquired within the past 12 months. Even though there are no symptoms at this stage, testing may suggest a recent infection based on earlier signs of syphilis, a recent negative test, or a partner with syphilis. Early latent syphilis is important to identify because treatment decisions and public health follow-up may differ.
Late latent
This means the infection has probably been present for more than 12 months, or the timing is unclear and it is treated as long-standing infection. People still do not have symptoms of latent syphilis, but the bacteria can remain in the body and may cause serious problems later if not treated. Sometimes answers come quickly, while other times it takes longer.
Unknown duration
Some doctors describe a separate category when there is not enough information to say whether latent syphilis is early or late. In practice, this is usually managed like late latent syphilis to make sure treatment is complete.
Outlook and prognosis
The outlook for latent syphilis is generally excellent when it is identified and treated appropriately, because antibiotic therapy usually prevents progression and long-term complications. Early latent syphilis has a particularly good prognosis, while untreated late latent syphilis can remain silent for years but still carries a risk of progression to tertiary disease affecting the heart, brain, nerves, or other organs. People with latent syphilis also remain at risk of transmitting infection to a fetus during pregnancy, so prompt treatment is especially important in pregnant patients. Mortality from latent syphilis itself is low when treatment is given, but untreated infection can eventually contribute to serious disability and premature death through cardiovascular or neurosyphilis complications. Follow-up blood tests are important because they help confirm response to treatment and detect reinfection or treatment failure.
Long-term effects
Latent syphilis often does not cause day-to-day symptoms, so many people feel well for months or even years. The main concern is not what you feel now, but what can happen later if the infection is not treated. Thinking about the long-term effects helps explain why follow-up and treatment matter so much. With proper antibiotics, the outlook for latent syphilis is usually very good, especially before organ damage develops.
During latent syphilis, people usually have no noticeable symptoms even though the infection is still in the body. This quiet phase can last a long time, which is why latent syphilis is often found only through blood testing.
If latent syphilis is not treated, some people go on to develop serious late complications years later. The long-term effects of latent syphilis can include damage to the brain, nerves, heart, blood vessels, skin, bones, or other organs.
Untreated infection can sometimes affect the brain and nerves, leading to problems with balance, walking, memory, vision, hearing, or bladder control. In some cases, these changes build slowly and may be mistaken for aging or another illness.
Latent syphilis can later damage the body’s main artery and nearby heart structures in a small number of people. This may raise the risk of chest pain, shortness of breath, or life-threatening vessel problems if it is not recognized.
How is it to live with Latent syphilis?
Living with latent syphilis can feel strange because you may feel completely well while still carrying an infection that needs treatment and follow-up blood tests. For many people, the hardest part is not physical symptoms but the uncertainty, the stress of notifying sexual partners, and the worry about pregnancy, since untreated syphilis can still harm a developing baby even when you have no symptoms. The good news is that latent syphilis is treatable, and with the right antibiotics and medical follow-up, most people can protect their health and greatly reduce the risk to others.
Treatment and drugs
Latent syphilis is treated with antibiotics to clear the infection and lower the risk of it causing problems later, even when there are no symptoms right now. Treatment often looks different for each person, but many people with latent syphilis receive penicillin, usually as a shot, and the number of doses depends on how long the infection may have been present. If someone cannot take penicillin, a doctor may suggest another antibiotic, although penicillin is still the preferred option in some situations, including pregnancy. After treatment, blood tests are repeated over time to make sure the infection is responding, because follow-up is an important part of care for latent syphilis. Partners may also need testing and treatment so the infection does not keep spreading or come back through re-exposure.
Can you cure Latent syphilis?
Yes, latent syphilis can usually be cured with antibiotics, most often penicillin, even though it may not be causing symptoms at the time. Treatment clears the infection and helps prevent serious problems later, but it cannot undo damage that may already have happened if the infection has been there for a long time. Many people need follow-up blood tests after treatment to make sure the infection is going away as expected.
Non-drug treatment
Latent syphilis usually does not cause day-to-day symptoms, so non-drug care is mainly about follow-up, preventing spread, and protecting long-term health. Managing this condition often means staying engaged with care even when you feel completely well. These steps do not remove the infection on their own, but they are an important part of treatment alongside antibiotics. This is especially important during pregnancy and for anyone who may have been exposed recently.
Regular medical follow-up helps make sure latent syphilis is responding to treatment as expected. Blood tests over time are a key part of follow-up testing for latent syphilis, because they show whether the infection markers are falling.
Sexual partners may need testing and treatment, even if they feel fine. Public health teams or clinic staff can often help with confidential partner notification so fewer people are missed.
It is usually safest to avoid sexual contact until a clinician says treatment and follow-up are on track. Safer sex habits, including condom use, can also lower the risk of passing on syphilis or picking up another sexually transmitted infection.
People with latent syphilis are often advised to be tested for other sexually transmitted infections, including HIV. This matters because coinfections can affect overall care and may change how closely you are monitored.
Your genes may have an impact on how drugs work for you
For latent syphilis, treatment response is usually not shaped in any meaningful way by your genes, and genetic testing is not a routine part of choosing treatment. Most people are treated with penicillin, and what matters more in day-to-day care is whether someone has a penicillin allergy, is pregnant, has HIV, or can return for follow-up blood tests to make sure the infection is clearing. In other words, unlike some other conditions where inherited differences can change how medicines work, that is not a major issue for the medicines commonly used for latent syphilis.
Pharmacological treatments
Treatment for latent syphilis aims to clear the infection before it causes future harm, even when there are no symptoms day to day. The main treatment is penicillin, and the exact schedule depends on whether the infection is early latent syphilis or late latent syphilis. Many people find relief when the right medicine is started, but follow-up blood tests are still important to make sure treatment is working. In pregnancy, penicillin is the preferred treatment because it best protects both the pregnant person and the baby.
This is the first-choice treatment for latent syphilis and is given as an injection into a muscle. For early latent syphilis, treatment is usually one dose, while late latent syphilis or latent syphilis of unknown duration is usually treated with 3 doses given 1 week apart.
This antibiotic may be used if someone cannot take penicillin and is not pregnant. It is taken by mouth, usually for 14 days in early latent syphilis and 28 days in late latent syphilis or infection of unknown duration.
This is another oral option for some people who cannot use penicillin, although it is used less often because it can be harder to tolerate and must be taken several times a day. Like doxycycline, the treatment length is usually longer for late latent syphilis than for early infection.
This antibiotic is sometimes considered when standard options cannot be used, but the best dose and treatment length for latent syphilis are less certain. Because evidence is more limited, many living with latent syphilis will still be guided toward penicillin when possible.
Genetic influences
If latent syphilis shows up on a blood test, it usually reflects an infection, not something you inherited from your parents. Genetics is only one piece of the puzzle, but latent syphilis is not considered a genetic disorder. Researchers think small inherited differences in the immune system may affect how the body responds to the bacteria that cause syphilis, which may help explain why illness can progress differently from one person to another. Even so, these genetic effects are not strong enough to predict who will get latent syphilis or to guide routine testing in everyday care. For most people, exposure risk, screening, and prompt treatment matter much more than family history. If others in your family have had syphilis, that usually points to shared circumstances or exposure patterns rather than an inherited cause.
Is Latent syphilis genetic?
Genetics usually are not a major driver of latent syphilis. Small differences in immune-related genes may slightly affect how the body handles infection, but exposure, testing, and treatment matter far more than inherited genetic variation.
Having a genetic risk is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widely seen in the general population. Most do not have a direct impact on health and simply reflect natural human diversity. For many genes, having a variant connected with a condition points to a possible link rather than a definite diagnosis, especially when several genes and environmental factors play a role. In some situations, though, one well-characterized variant in a particular gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
People often ask how genetics affect latent syphilis treatment, but for most, the answer is: only a little, based on what doctors know today. For people with latent syphilis, the usual treatment is still chosen mainly by factors such as pregnancy, penicillin allergy, and how long the infection may have been present, not by a genetic test. Not every difference in response is genetic, but genes can sometimes influence how your body handles a medicine or how likely side effects may be. Even so, pharmacogenetic testing is not a routine part of care for latent syphilis, because there is no widely used genetic result that reliably changes the standard treatment plan. If penicillin cannot be used, doctors may choose another antibiotic and follow up closely to make sure the infection has been treated.
Interactions with other conditions
Latent syphilis often causes no day-to-day symptoms, so it may come to light only when someone is being checked for another sexually transmitted infection or during routine blood work. Having more than one diagnosis can make symptoms feel harder to untangle, especially because syphilis can occur alongside HIV, and each infection can affect how quickly the other is recognized and treated. In people living with HIV, latent syphilis may be more likely to behave unpredictably, so doctors may watch more closely for signs that it is affecting the brain, eyes, or nerves. Latent syphilis can also be confused with autoimmune conditions or other infections because the blood tests are not always straightforward, and sometimes results need to be interpreted alongside symptoms and exam findings. Another important aspect is how it may link with other diseases: having syphilis can increase the chance of catching or passing on HIV because sores from earlier stages can make it easier for viruses to enter the body. If you are being treated for latent syphilis and another infection at the same time, it is worth asking how the conditions and medicines may affect follow-up testing, since the timing of repeat blood tests matters.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Latent syphilis?
Latent syphilis usually causes no symptoms, so it is more often confused with a past syphilis infection that was already treated or with a blood test that looks positive even though syphilis is not present. This can happen with pregnancy, immune system illnesses such as lupus, and some infections such as HIV, hepatitis, or Lyme disease.
History
Long before modern lab tests existed, doctors noticed that some people seemed to recover after the first signs of syphilis, only to learn later that the infection had not truly gone away. A sore might heal, a rash might fade, and daily life could feel completely normal for months or even years. This quieter stage is called latent syphilis, and its history helps explain why regular testing became so important.
Since the earliest medical writings, efforts have been made to understand why syphilis could seem to disappear and then return in a different form. For many years, diagnosis relied only on visible changes and symptoms, so latent syphilis was easy to miss because people often felt well. As medical science evolved, blood testing made it possible to detect infection even when there were no outward signs, which changed care in a major way and helped doctors separate active symptoms from hidden infection.
In the late 19th and early 20th centuries, researchers began to describe syphilis more clearly as a disease that could move through stages. That included a symptom-free period after the early symptoms of latent syphilis had replaced the more obvious first and second stages. Over time, this led to the now-familiar distinction between early latent and late latent infection, which helps guide follow-up and treatment.
The history of latent syphilis is also tied to public health. Before antibiotics, untreated syphilis could lead to serious problems years later, affecting the brain, nerves, heart, or pregnancy. Once penicillin became available in the 20th century, treatment dramatically reduced these long-term complications, but latent syphilis did not disappear. Because people can carry the infection without feeling sick, routine screening in pregnancy, sexual health care, and higher-risk settings remains a key part of prevention today.
Looking back helps explain why latent syphilis still matters. It is a stage that can be silent, but it is not harmless, and its history shows how much progress came from better testing, clearer staging, and earlier treatment.