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Lack of transmission of HIV through human bites and scratches
C M Tsoukas1, T Hadjis, J Shuster
1Division of Clinical Immunology, Montreal General Hospital, Canada.
Abstract:
To examine the relative risk of transmission of the human immuno-deficiency virus (HIV) through bites and scratches, we studied 198 health care workers, 30 of whom were traumatized in this fashion while caring for an aggressive AIDS patient. This violent patient frequently bit or scratched others, his mouth had blood and saliva, while his fingernails were at times soiled with semen, feces, and urine. He was HIV antibody and antigen positive. Although HIV was recovered from his peripheral blood lymphocytes, after 2.5 years of serial follow-up, all traumatized personnel were clinically normal, no HIV was cultured from their blood, and all were HIV antibody and P24 antigen negative. We conclude that this viremic AIDS patient, while producing copious amounts of body fluids, failed to infect those caring for him through bites and scratches. The risk of transmission of HIV through this route under similar conditions should be low.
Insights
Healthcare workers exposed to bites and scratches from an aggressive, viremic AIDS patient did not contract human immuno-deficiency virus (HIV). This study suggests a low risk of HIV transmission via bites and scratches, even with significant exposure.
Area of Science:
- Infectious Diseases
- Virology
- Occupational Health
Background:
- Understanding the transmission routes of human immuno-deficiency virus (HIV) is crucial for healthcare worker safety.
- Previous data on HIV transmission through non-percutaneous injuries like bites and scratches is limited.
- Assessing the risk associated with exposure to bodily fluids from a viremic patient is essential for infection control protocols.
Observation:
- A cohort of 198 healthcare workers was studied, with 30 experiencing bites or scratches from an aggressive, HIV-positive AIDS patient.
- The patient exhibited high viral load, with HIV detected in blood lymphocytes.
- Bodily fluids, including blood, saliva, semen, feces, and urine, were involved in the traumatic exposures.
Findings:
- Despite direct exposure to infectious bodily fluids through bites and scratches, none of the 30 exposed healthcare workers seroconverted for HIV.
- Extensive follow-up over 2.5 years revealed no clinical signs of HIV infection, negative HIV cultures, and absence of HIV antibodies and P24 antigen in the exposed personnel.
- The viremic AIDS patient, despite producing substantial amounts of infectious fluids, did not transmit HIV to the healthcare workers through these specific injury types.
Implications:
- The findings suggest that the risk of HIV transmission through bites and scratches from a viremic patient, under similar conditions, is low.
- This study contributes valuable data for refining occupational safety guidelines and risk assessments for healthcare professionals handling patients with HIV.
- Further research may explore the specific factors influencing transmission, such as viral load in saliva and the integrity of the exposed skin or mucous membranes.