The majority of cases of laboratory-related infections are associated with which factor?

• A. Infectious aerosols
• B. Contamination of abraded skin
• C. Puncture wounds
• D. Person-to-person transmission

Answer: (A)

Aerosols generated during routine lab manipulations are the main route of laboratory-acquired infections. When cultures or specimens are handled, small particles can become suspended in the air and be inhaled or come into contact with mucous membranes. Activities like vortexing, pipetting, centrifugation, and opening tubes can release these aerosols. Because they can travel and remain airborne, aerosols pose a greater exposure risk than skin contamination, puncture wounds from sharps, or person-to-person spread in many lab environments. Protective measures such as biosafety cabinets, proper ventilation, and appropriate PPE are specifically aimed at limiting aerosol exposure, which is why this route explains most lab-related infections.