Why partner care matters
When an STI is diagnosed, the goal is to assess and treat partners and prevent reinfection, not to establish who is at fault.[1]
A positive result does not always show when infection happened or who was infected first, because many STIs are silent and can persist for a long time.[1]
The benefits of partner care
If only the person diagnosed is treated while a partner still carries the infection, the next sexual contact can cause reinfection. Caring for partners at the same time reduces reinfection and onward transmission and prevents complications in partners who may not know.[1]
Doing this without blame protects the relationship and encourages everyone to get tested.
How common are STIs?
The World Health Organization estimated about 374 million new infections with four curable STIs worldwide among people aged 15–49 in 2020.[4] This is incidence rather than total prevalence. An STI diagnosis is common, not shameful.
Why a result does not show who came first
Partners can be infected without symptoms, and each infection has its own incubation period and window period for testing.[1],[2] For example:
- One partner tests positive and the other negative: testing may have been too early, or not all sites were tested.
- Some infections persist for a long time, such as chlamydia, latent syphilis or herpes, and may pre-date the current relationship.
- New symptoms do not necessarily mean a new infection.
Information used to plan partner care
Your doctor uses the following to plan partner testing or treatment[1],[2]:
- The infection diagnosed.
- Dates of sexual contact with each partner, since each infection has its own look-back period for notification.
- Sites exposed, to choose where partners should be tested.
- Previous treatment for both people.
Steps after a diagnosis
Avoid sex as advised for the specific infection. For gonorrhoea and chlamydia, for example, avoid sex for about seven days after treatment and until partners have also been treated.[1],[2]
Partners should be assessed. Medicine for a partner requires appropriate assessment and must follow local prescribing rules. Do not share your own course, as both of you may end up undertreated or on the wrong drug.[1]
Review prevention: condoms, vaccines such as hepatitis B and HPV, PrEP or PEP for HIV, and retesting as advised.[1]
How to tell a partner. Choose a calm moment and focus on facts and next steps, for example: “My test found this infection, and the doctor recommends you get tested too,” rather than blame. If you would rather not tell them yourself, ask your doctor to help plan it.
How we care for you at Dr. Kris Clinic
When an STI is diagnosed, we explain which partners should be tested, how far back to go and which sites to test, in English or Thai. We help you think through how to tell a partner, and we are happy to see your partner confidentially at the clinic.
If worry or conflict is affecting your relationship, couples counselling at Kris Care Space can help you talk safely.
Frequently asked questions
Does a positive result mean my partner cheated?
Not necessarily. Many STIs are silent and persist for a long time, so a result cannot show who was infected first or when.
Can I share my medicine with my partner?
No. Your partner needs proper assessment and the right medicine; sharing leaves both of you undertreated.
My partner has no symptoms. Do they still need testing?
Yes. Most infections are silent and can cause reinfection.
I'm afraid to tell my partner. What should I do?
Talk to your doctor about a safe way to tell them, and say so if you feel unsafe with your partner.
Communicate safely and follow the infection-specific plan.[1] The aim is for everyone to be treated and reinfection prevented, not to assign blame.
Talk to a doctor about this
Confidential care in Surat Thani, the mainland gateway to Koh Samui, Koh Phangan and Koh Tao. Tue–Fri 17:00–20:00 · Sat–Sun 10:00–15:00 (UTC+7)
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Dr. Krida Uakridathikarn (Dr. Kris)
Board-certified family physician with certificate training in clinical sexology and sexual medicine. He works at Suratthani Hospital and provides sexual health, hormone and LGBTQ+ inclusive care at Dr. Kris Clinic. Profile and CV
References
- CDC STI Treatment Guidelines (2021; current online guidance)
- CDC STI Guidelines: Gonococcal Infections in Adults
- CDC STI Guidelines: Genital Herpes
- WHO: Sexually transmitted infections; estimates for 2020/2022
Keep reading
Main guide: HIV & STI prevention
Which STI Tests Do You Need, and When?
Syphilis: Symptoms, Testing and Stage-Based Treatment
Gonorrhoea and Chlamydia: Symptoms, Testing and Proper TreatmentThis article is general education, not personal medical advice or a promise of results. Diagnosis and treatment require assessment by a doctor. Content reflects the cited sources as of the update date.