What Happened?

An animal technician sustained a needlestick injury while consolidating biohazard waste from trash containers in animal rooms into a larger waste barrel. As they reached into the barrel to tie the bag, she was pricked by a needle that had been improperly discarded in the waste bag and was concealed near the top of the contents. The technician immediately notified their supervisor and sought medical evaluation at the Occupational Health Facility.

At the time of the incident, she was wearing full PPE, including two pairs of gloves. Although the waste originated from a room labeled “Non-Active,” indicating no known active biohazard work, the improperly discarded needle still presented a sharps injury and potential exposure hazard because sharps must be disposed of in puncture-resistant sharps containers, not loose in waste bags.

What Was The Cause?

• Immediate cause: Direct contact with an improperly discarded loose sharp during waste handling caused the needlestick.
• Underlying causes:
  • A needle had been improperly disposed of in a biohazard bag instead of a puncture-resistant sharps container, allowing it to remain hidden and accessible during subsequent handling.
  • The task required the technician to reach by hand into a waste barrel, creating a blind-reach hazard with no physical barrier between the hand and the contents of the bag.
  • Double gloves provided protection against contamination but did not prevent needle puncture.
• Root causes:
  • Sharps segregation at the point of generation was not followed or enforced, despite standard guidance requiring immediate disposal of needles into approved sharps containers.
  • Waste-handling procedures did not adequately prevent downstream workers from being exposed to hidden sharps in soft-sided bags, indicating a gap in the facility’s sharps disposal and waste management system.
  • Training, supervision, or accountability for proper sharps disposal in animal rooms was insufficient, allowing a loose needle to enter the general biohazard waste stream.

How Can Incidents Like This Be Prevented?

Animal technicians are at the mercy of the research community. The best way to prevent incidents like this:

• Require immediate disposal of all needles into approved puncture-resistant sharps containers at the point of generation, never into red bags or soft waste liners.
• Place sharps containers in all animal rooms and at any station where needles may be used, so staff do not rely on temporary disposal practices.
• Prohibit employees from reaching into waste barrels by hand to compress, reposition, or tie bags; use an external tie-off method or a tool-assisted closure method instead. In the external tie-off method, the technician pulls the bag neck upward above the barrel rim, twists the excess bag material, and closes it from outside the container using an overhand or gooseneck-style closure, often secured with a zip tie or tape. This works only if the bag is not overfilled.
• Revise training so that “Non-Active” does not imply “no sharps risk,” and emphasize that room status labels do not replace sharps segregation controls.
• Add a waste-handling SOP checkpoint requiring visual inspection of bags and immediate escalation if a sharp is suspected in biohazard waste bags.

Resources

• Risk Group Classification for Infectious Agents