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If you shared a needle, syringe, or other injection equipment, contact a clinician promptly. If the exposure was within the past 72 hours, seek urgent care now and ask whether HIV post-exposure prophylaxis (PEP) is appropriate. When indicated, PEP should start as soon as possible; do not wait for test results or for the other person’s records before seeking assessment.
What should you do first?
- Write down when the exposure happened. The time elapsed affects whether HIV PEP may be an option.
- Get medical advice promptly. Contact an emergency department, urgent care, or another clinician able to assess PEP. Tell them what equipment was shared, whether blood exposure occurred, and any details you know about the source person’s HIV or hepatitis status.
- Ask about all three infections. Request an assessment for HIV, hepatitis C (HCV), and hepatitis B (HBV), including what testing and follow-up fit your circumstances.
- Share your own health history. Mention hepatitis B vaccination, previous immunity or infection test results, and any medicines you take.
Do not delay care to find out the source person’s test results. That information may help a clinician assess the exposure, but it is not a reason to postpone urgent evaluation.
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How do HIV, hepatitis C, and hepatitis B care differ?
| Infection | Immediate prevention question | Testing and follow-up | What changes the plan |
|---|---|---|---|
| HIV | Ask urgently about PEP if exposure was within 72 hours. CDC’s 2025 guidance recommends starting indicated PEP as soon as possible, ideally within 24 hours, and taking it for 28 days. | For people starting PEP, CDC recommends lab-based antigen/antibody (Ag/Ab) and diagnostic nucleic acid testing (NAT) at 4–6 weeks and 12 weeks after exposure. | Whether blood exposure occurred, the source person’s HIV status and viral suppression, and the exposure details. |
| Hepatitis C (HCV) | There is no preventive medicine timeline described in the cited CDC guidance; prompt evaluation can identify whether infection is present and needs treatment. | For possible exposure within the past six months, CDC says HCV RNA NAT is preferable to relying on antibody testing alone. CDC’s more detailed 3–6-week and 4–6-month schedule is occupational guidance for exposed health-care personnel, not an automatic protocol for community exposures. | Recent exposure, source test results, and whether follow-up is indicated. |
| Hepatitis B (HBV) | Ask a clinician whether your vaccination or prior immunity changes the need for post-exposure care. | The cited detailed CDC post-exposure table covers health-care settings; it does not establish a universal schedule for community needle sharing. | Your vaccination and immunity history and the source person’s status. |
These tests answer different questions and have different detection windows. A negative test taken soon after an exposure may not rule out infection from that event; use the follow-up plan set by a clinician.
HIV: when PEP may be recommended
Sharing needles, syringes, or other injection equipment can expose someone to blood and is a possible route of HIV exposure. Under CDC’s 2025 nonoccupational PEP guidance, clinicians recommend PEP after a blood exposure involving shared injection equipment when the source has HIV with detectable viremia or unknown viral suppression. If it is unknown whether the source has HIV, the decision is made case by case; that uncertainty alone does not establish an individual risk level.
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PEP is prescription emergency care, not an over-the-counter product or a substitute for testing. A clinician should not delay the first dose while waiting for pending lab results when PEP is indicated. The clinician will assess the exposure and your medical circumstances.
If more than 72 hours have passed
Still seek medical assessment. CDC recommends HIV testing, prevention counseling (including discussion of PrEP when relevant), and a follow-up testing plan for people who present after the PEP window. A clinician can also assess hepatitis testing and any other care needed.
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Why follow-up HIV tests matter
A baseline test records your status at the time of presentation; it cannot rule out infection from a very recent exposure. CDC’s 2025 schedule for people who start PEP includes an interim lab-based Ag/Ab test plus diagnostic NAT at 4–6 weeks after exposure and final testing with both methods at 12 weeks. In a limited circumstance—PEP started within 24 hours and no doses missed—the clinician may defer the interim test. Follow the treating clinician’s instructions about whether that exception applies.
Hepatitis C: ask for testing suited to a recent exposure
HCV can spread through shared injection equipment. CDC recommends HCV testing for people who currently or previously injected drugs and shared needles, syringes, or equipment used to prepare drugs. When possible exposure was within the past six months, CDC says to use HCV RNA NAT when possible rather than relying on an antibody test alone. A positive RNA result indicates current infection and warrants evaluation for treatment.
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CDC’s detailed follow-up algorithm is written for health-care personnel exposed to HCV: baseline anti-HCV testing with reflex RNA testing if the antibody result is positive; when follow-up is indicated, HCV RNA NAT at 3–6 weeks; and, if RNA is negative, final anti-HCV testing at 4–6 months, with reflex RNA testing if positive. In that occupational guidance, follow-up is indicated when the source is HCV RNA positive, anti-HCV positive without known RNA status, or cannot be tested. A clinician should individualize testing after community needle sharing rather than assume this workplace schedule applies unchanged.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Hepatitis B: vaccination and prior immunity matter
Tell the clinician whether you completed hepatitis B vaccination, have had immunity testing, or know the source person’s HBV status. Post-exposure management can vary with those details. The cited CDC table addresses health-care settings, so its exact branches should not be applied as a universal community-exposure protocol; ask a clinician to review your records and use guidance appropriate to your situation.
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Reduce the chance of another exposure
For future injections, CDC recommends using a new, clean needle and injection equipment every time. A local syringe services program may provide or connect you with sterile supplies and safe disposal. These steps are for prevention; they do not replace evaluation or testing for the exposure that already happened. If you may be exposed again, ask a clinician whether ongoing HIV prevention, including PrEP, is appropriate.
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- Exposure within 72 hours: seek urgent care now and ask specifically about HIV PEP.
- Exposure more than 72 hours ago: arrange medical assessment for HIV testing, a follow-up plan, and hepatitis evaluation.
- Any timing: tell the clinician what was shared, when it happened, whether blood exposure occurred, and what you know about vaccination and the source person’s status.
This is general U.S.-focused guidance based on CDC recommendations, not an individual diagnosis or testing plan. The clinician’s advice may depend on the exposure, its timing, source information, your health history, and applicable local guidance.
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