Assessing Viral Transfer during Doffing of Ebola-Level Personal Protective Equipment in a Biocontainment Unit

Abstract

Background. Personal protective equipment (PPE) protects healthcare workers (HCWs) caring for patients with Ebola virus disease (EVD), and PPE dofng is a critical point for preventing viral self-contamination. We assessed contamination of skin, gloves, and scrubs afer dofng Ebola-level PPE contaminated with surrogate viruses: bacteriophages MS2 and F6. Methods. In a medical biocontainment unit, HCWs (n = 10) experienced in EVD care donned and doffed PPE following unit protocols that incorporate trained observer guidance and alcohol-based hand rub (ABHR). A mixture of F6 (enveloped), MS2 (nonenveloped), and fluorescent marker was applied to 4 PPE sites, approximating body fluid viral load (F6, 105; MS2, 106). Tey performed a patient care task, then do?ed. Inner gloves, face, hands, and scrubs were sampled for virus, as were environmental sites with visible fluorescent marker. Results. Among 10 HCWs there was no F6 transfer to inner gloves, hands, or face; 1 participant had F6 on scrubs at low levels (1.4 × 102). MS2 transfer (range, 101-106) was observed to scrubs (n = 2), hands (n = 1), and inner gloves (n = 7), where it was highest. Most (n = 8) had only 1 positive site. Environmental samples with visible fluorescent marker (n = 21) were negative. Conclusions. Among experienced HCWs, structured, observed dofng using ABHR protected against hand contamination with enveloped virus. Nonenveloped virus was infrequent on hands and scrubs but common on inner gloves, suggesting that inner gloves, but not necessarily ABHR, protect against hand contamination. Optimizing dofng protocols to protect against all types of viruses may require reinforcing careful handling of scrubs and good glove/hand hygiene with e?ective agents.