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Updated: Jul 9, 2026

Ex Vivo Infection of Human Lymphoid Tissue and Female Genital Mucosa with Human Immunodeficiency Virus 1 and Histoculture
Published on: October 12, 2018
A seminal finding for understanding HIV transmission.
Nadia R Roan1, Warner C Greene
1Gladstone Institute of Virology and Immunology, University of California, San Francisco, 1650 Owens Street, San Francisco, CA 94158, USA. nroan@gladstone.ucsf.edu
Human semen contains a factor that dramatically increases human immunodeficiency virus (HIV) infectivity. This finding may explain the discrepancy between high HIV incidence and low in vitro infectivity.
Area of Science:
- Virology
- Immunology
- Reproductive Health
Background:
- The human immunodeficiency virus (HIV) exhibits low infectivity in laboratory settings despite its high global incidence.
- Understanding factors influencing HIV transmission is crucial for developing effective prevention strategies.
Discussion:
- Münch et al. (2007) identified a specific factor present in human semen.
- This seminal fluid factor significantly enhances HIV infectivity under specific conditions, increasing it by over 100,000-fold.
- This discovery offers a potential explanation for the observed difference between in vivo transmission rates and in vitro infectivity.
Key Insights:
- Identification of a novel semen-derived cofactor that potentiates HIV infectivity.
- Quantification of the infectivity enhancement ( >100,000-fold) attributed to this factor.
- Provides a molecular-level insight into HIV transmission dynamics.
Outlook:
- Further research into the precise mechanism of action of this semen factor.
- Potential therapeutic targets for blocking this enhancement and reducing HIV transmission.
- Implications for understanding sexual transmission of HIV and designing targeted interventions.
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