Risk of human immunodeficiency virus (HIV-1) infection among laboratory workers

Area of Science:

• Virology
• Occupational Health
• Infectious Diseases

Background:

• Occupational exposure to human immunodeficiency virus type 1 (HIV-1) poses a risk to laboratory personnel.
• Previous studies have documented HIV-1 transmission through needlestick injuries and other parenteral exposures.

Purpose of the Study:

• To investigate the risk of HIV-1 infection among laboratory workers with potential occupational exposure.
• To assess the effectiveness of Biosafety Level 3 containment in preventing HIV-1 transmission in a laboratory setting.

Main Methods:

• A prospective cohort study was conducted involving 265 laboratory and affiliated workers.
• Molecular analyses were performed on HIV-1 isolates from an infected worker and compared to known strains.
• Incidence rates of HIV-1 infection were calculated based on duration and type of exposure.

Main Results:

• One worker, with no known risk factors, tested HIV-1 seropositive at study entry.
• Molecular analysis revealed the HIV-1 isolate was indistinguishable from a known laboratory strain (H9/HTLV-IIIB).
• The incidence rate of HIV-1 infection was 0.48 per 100 person-years of exposure, comparable to healthcare workers with needlestick injuries.

Conclusions:

• Prolonged laboratory exposure to concentrated HIV-1 poses a risk of infection, potentially through undetected skin contact.
• Strict adherence to Biosafety Level 3 containment and practices is crucial when handling concentrated HIV-1.
• Further refinement of laboratory safety procedures may be necessary to minimize occupational HIV-1 transmission risk.