Clinical trial Recruiting at 1 site Observational Ages 18 and up

Understanding early HIV infections in Zurich

Official title: Characterization of Acute and Recent HIV-1 Infections in Zurich. a Long-term Observational Study: the Zurich Primary HIV Infection Study.

Run by University of Zurich · NCT00537966 · Data updated 2026-11-12

This study looks at how early HIV infections affect people's health and how starting treatment right away can change the course of the disease for those newly diagnosed in Zurich.

Quick facts

Study typeObservational
Ages18 Years and up
SexAll
Enrollment800 (estimated)
SponsorUniversity of Zurich
Academic / other
Drugs / interventionscART
Locations1 site (Zurich)
StatusRecruiting
StartedJanuary 2002
Main results expectedDecember 2028
Study endsDecember 2028
Registry record updatedDecember 17, 2024
Trial IDNCT00537966 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates include individuals with acute or recent HIV-1 infections, defined by specific clinical and laboratory criteria.

Probably not a fit

Patients with documented HIV infections established more than 180 days after presumed infection will not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This observational study aims to characterize factors influencing the course of primary HIV infection (PHI) and how these factors can be affected by PHI. It involves a longitudinal approach, continuously enrolling patients with documented acute or recent HIV-1 infections since 2002. The study focuses on the epidemiology of early HIV infection, the impact of early combination antiretroviral therapy (cART), and aims to inform future research on disease progression, transmission, vaccine development, and new treatment strategies.

Why it matters

Potential benefit: If successful, this study could enhance understanding of early HIV infections, leading to improved treatment and prevention strategies.

How similar studies have gone: Other studies focusing on early HIV infections have shown promise, indicating that this approach is supported by previous research.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

A) acute HIV-1 infection, defined as:

* negative or evolving immunoblot in the presence of positive p24 Ag and/or detectable plasma HIV-1 RNA and/or
* documented HIV seroconversion within 90 dayswith or with-out symptoms and/or clinical signs of PHI (e.g. acute retro-viral syndrome).

B) recent HIV-1 infection, defined as:

* documented seroconversion of more than 90 days but within 180 days and/or
* evolving immunoblot after unambiguous transmission risk (e.g. iv drug use, sexual contact) within 180 days and/or
* documented HIV infection and unambiguous transmission risk (iv drug use, sexual contact) within 180 days and/or
* documented HIV infection and possible transmission risk (iv drug use, sexual contact) within the last 180 days after infection AND \< 0.5% fraction of ambiguous nucleotides

Exclusion Criteria:

• Documented HIV infection, however, established diagnosis more than 180 days after presumed date of infection.

Where it's running

  • University of Zurich
    Zurich, Switzerland
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.