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69d6 Sexually Transmitted Infections and Prevention | How Sexually Transmitted Infections Spread, Prevention, Testing, and Partner Communication


Sexually transmitted infections can affect people who have sexual contact, and some infections may be present without obvious symptoms. Knowing how transmission can occur helps people make practical choices about protection, testing, treatment, and communication without relying on appearance or assumptions about a partner.
The following topics focus on reducing risk, understanding symptom-free infection, deciding when testing may be appropriate, following treatment advice, and discussing testing or infection with sexual partners. The emphasis is on informed action rather than blame or stigma.

69d6.1 How Sexually Transmitted Infections Can Spread

Sexually transmitted infections spread mainly through sexual contact involving genital fluids, skin-to-skin contact in affected areas, or blood, depending on the infection. Vaginal, anal, and oral sexual activity can carry different levels of risk. Some infections can also pass through shared needles or from a pregnant person to a baby during pregnancy, birth, or breastfeeding. Everyday contact such as sharing ordinary food, casual touching, or using the same room does not spread most STIs.
Because transmission routes differ, a single prevention method does not work equally for every infection. Condoms and other barriers reduce risk for many infections but may not cover all affected skin. Vaccines can prevent certain infections where recommended, and testing can identify infections that are not causing symptoms. A person's appearance or reputation cannot show whether an infection is present. Understanding the actual route of transmission helps people choose protection based on evidence rather than fear or stigma.

69d6.2 Reducing the Risk of Sexually Transmitted Infections

STI risk can be reduced through several measures used together. Condoms or other barriers lower exposure during sexual contact when used correctly and consistently. Limiting sexual contact to situations where partners can discuss protection and testing may make risk easier to manage. Vaccination is available for some infections, and testing can identify infections that would otherwise remain unnoticed. Avoiding shared needles or other equipment that may contain blood is also important.
Risk reduction is not the same as guaranteeing safety. A partner may have an infection without symptoms, and a recent test does not protect against exposures that happen afterward. People with a new partner, multiple partners, symptoms, known exposure, or other risk factors can ask a health service what testing schedule fits their situation. If a prevention method fails or a person has a substantial possible HIV exposure, HIV post-exposure prophylaxis (PEP) may be an option. PEP should be started as soon as possible and no later than 72 hours after exposure. PEP does not replace routine STI prevention, testing, or other protective measures. Decisions should be based on the activity and infection risk rather than stereotypes about who is "safe".

69d6.3 Why Some Infections Have No Obvious Symptoms

Some sexually transmitted infections can remain in the body without causing pain, sores, discharge, or other obvious signs. A person may therefore feel completely well and still have an infection that can be passed to someone else or cause health problems later. The absence of symptoms cannot be used as proof that either partner is infection-free, and looking healthy is not a substitute for testing.
This is one reason screening recommendations are based on factors such as age, sexual practices, new or multiple partners, pregnancy, known exposure, and local health guidance rather than symptoms alone. Testing too soon after an exposure may also miss some infections because different tests have different detection periods. A clinic can advise on the correct test and timing. When symptoms do occur, they may have causes other than an STI, so diagnosis should be based on proper assessment rather than shame, suspicion, or assumptions about a partner's behavior.

69d6.4 Knowing When STI Testing Is Appropriate

STI testing may be appropriate after a known exposure, when symptoms suggest an infection, before or during pregnancy, when starting a new sexual relationship, or as part of routine screening for people with particular risk factors. The exact recommendations depend on age, sexual practices, local infection patterns, previous results, and the services available. Not every test checks for every STI, so asking what is included matters.
Timing also affects accuracy. Some infections can be detected soon after exposure, while others need more time before a test becomes reliable. A negative result taken too early may therefore need repeat testing. Clinics may use blood, urine, swabs, or other samples depending on the infection. Testing should be combined with a plan for receiving results, treatment if needed, and partner communication where appropriate. A person who is uncertain about a recent exposure can describe the activity confidentially to a health professional and ask which tests and timing apply.

69d6.5 Getting Treatment and Following Medical Advice

When an STI is diagnosed, treatment and follow-up depend on the specific infection. Some infections can be cured with appropriate medicines, while others can be controlled but remain in the body. Taking the prescribed treatment as directed, completing it when instructed, and attending follow-up testing when recommended can reduce complications and further transmission. Using leftover medicines or another person's treatment may fail because the cause and correct medicine can differ.
A clinician may advise avoiding sexual contact for a period, using barriers, or ensuring recent partners are tested or treated. Those instructions should be followed for the diagnosed infection rather than replaced by a general rule. Symptoms improving does not necessarily prove the infection has cleared. If side effects make treatment difficult, contact the prescribing service before stopping or changing it. New severe symptoms, pregnancy, or concern about treatment failure should also be discussed promptly so care can be adjusted safely.

69d6.6 Talking With Sexual Partners About Testing and Infection

Talking with a sexual partner about testing or an infection can feel difficult, but clear information helps both people make decisions about care and future contact. The conversation should focus on what is known: the test result or exposure, health-professional advice, whether partners should be tested or treated, and what protection is needed in the meantime. Accusations are often unhelpful because some infections can remain unnoticed for a long time and a result may not show when transmission occurred.
Choose a time and place that is as private and safe as possible. If there is a risk of violence, coercion, or retaliation, a clinic may be able to advise on safer notification options rather than encouraging direct contact. Some health systems provide confidential partner-notification services. Until guidance is clear, partners can avoid sexual contact or use recommended barriers. Sharing accurate information protects health; sharing someone's diagnosis publicly without permission can cause unnecessary harm and stigma.