STDTest.online · Health education

STDs & STIs A–Z

Browse the STI A–Z explorer. Condition guides publish here after qualified clinical review. Entries marked “in preparation” have no guide yet.

11 published educational guides in this hub.

Viral STIs

Herpes, HIV, HPV, and hepatitis guides. 8 guides.

Genital Herpes: HSV-1 and HSV-2 Explained HSV-1 and HSV-2 both cause genital herpes with different recurrence patterns. Learn type distinctions, testing, and what typing changes. Hepatitis B: Transmission, Testing, and Vaccination Hepatitis B spreads sexually and through blood, and can become chronic. Learn testing panels, vaccination, and perinatal prevention. Hepatitis C and Sexual Transmission Hepatitis C spreads mainly through blood, with sexual transmission concentrated in specific groups. Learn routes, testing, and curative treatment. High-Risk vs Low-Risk HPV Types High-risk HPV types cause cancers; low-risk types cause warts. Learn the type list, what typing means for care, and vaccination coverage. HIV-1 vs HIV-2: Key Differences HIV-1 drives the global pandemic; HIV-2 is West African, slower, and harder to detect. Learn the virologic and clinical differences. HIV: Symptoms, Testing, and Prevention Learn how HIV spreads, how modern testing works, how treatment suppresses the virus, and how PrEP and PEP prevent infection. HPV: Symptoms, Vaccination, and Screening Guide HPV is the most common STI. Learn about genital warts, cancer risks, Gardasil 9 vaccination, and cervical screening schedules. Oral Herpes vs Genital Herpes HSV-1 favors the mouth and HSV-2 the genitals. But either site can host either type. Learn location, testing, and crossover risks.

Bacterial STIs

Syphilis, trichomoniasis, and mycoplasma guides. 3 guides.

Syphilis: Stages, Testing, and Treatment Syphilis progresses in stages with different signs. Learn how blood testing, stage-based treatment, and follow-up work. Mycoplasma Genitalium: Causes, Testing, Treatment Mycoplasma genitalium is an emerging cause of urethritis and cervicitis. Learn when to suspect it, how NAAT testing works, and treatment. Trichomoniasis: Symptoms, Testing, and Treatment Trichomoniasis is a common parasitic STI that is often silent. Learn symptoms, NAAT testing, and treatment basics.

STI A–Z explorer

Filter conditions alphabetically. Entries marked “in preparation” have no guide yet.

Bacterial vaginosis

Other genital condition

Not an STI, but linked to sexual activity; included for clarity.

Guide in preparation. Publishes after clinical review.
Chancroid

Bacterial

Rare bacterial STI causing genital sores.

Guide in preparation. Publishes after clinical review.
Chlamydia

Bacterial

Common bacterial STI; often symptomless.
Related guide →
Genital herpes

Viral

HSV-1 or HSV-2; recurrent sores possible.
Related guide →
Gonorrhea

Bacterial

Bacterial STI with rising antibiotic resistance.
Related guide →
Hepatitis B

Viral · vaccine-preventable

Vaccine-preventable virus; sexually transmissible.
Related guide →
HIV

Viral

Virus affecting immunity; PrEP and PEP prevent transmission.
Related guide →
HPV

Viral · vaccine-preventable

Very common virus; vaccination prevents most cancers it causes.
Related guide →
Lymphogranuloma venereum (LGV)

Bacterial

Chlamydia variant causing invasive disease.

Guide in preparation. Publishes after clinical review.
Mycoplasma genitalium

Bacterial

Emerging cause of urethritis and cervicitis.
Related guide →
Pubic lice

Parasitic

Parasitic infestation spread by close contact.

Guide in preparation. Publishes after clinical review.
Scabies

Parasitic

Mite infestation; sexual contact is one route.

Guide in preparation. Publishes after clinical review.
Syphilis

Bacterial

Staged bacterial infection; testing and follow-up essential.
Related guide →
Trichomoniasis

Parasitic

Common parasitic STI; often symptomless.
Related guide →
Zika virus

Viral

Sexually transmissible; relevant in pregnancy.

Guide in preparation. Publishes after clinical review.