Donning and doffing - why protective gear protocols are crucial

The current Ebola crisis has demonstrated that ‘inadvertent’ contamination is very hard to eradicate and can have deadly consequences.

Personal protective gear offers scientists and healthcare workers very high levels of protection but just wearing it while you work is not enough. How personal protective gear is removed is just as crucial as wearing it if you want to prevent exposure to contaminants such as viruses. Rigorous steps exist - and must be taken - to avoid inadvertent contact of exposed skin and mucous membranes to infected body fluids.

According to  physician-specialists from Johns Hopkins and the University of North Carolina, personal protective equipment, including goggles or face shields, gloves and gowns, is effectively decreasing West African caregivers’ exposure to infected bodily fluids, but workers are still at risk “if removal of protective clothing that is contaminated with infectious bodily fluids is not done in a manner that prevents exposure”. Trish M Perl, MD, MS and Noreen Hynes, MD, MPH are two Johns Hopkins infectious disease experts who authored a commentary published online in the Annals of Internal Medicine.

“The physical exhaustion and emotional fatigue that come with caring for patients infected with Ebola may further increase the chance of an inadvertent exposure to bodily fluids on the outside of the personal protective equipment, leading to unwanted contact when the gear is removed,” the authors say. “The impulse to wipe away sweat in the ever-present hot, humid environment during personal protective equipment removal may lead to inadvertent inoculation of mucous membranes” in and on the nose, mouth and eyes.

According to the World Health Organization, the unprecedented outbreak of Ebola in West Africa has resulted in a “high proportion of doctors, nurses and other health care workers who have been infected”.

The World Health Organization claims that more than 240 health care workers have developed the disease in Guinea, Liberia, Nigeria and Sierra Leone. More than 120 have died, including prominent doctors in Sierra Leone and Liberia.

Despite the challenges of preventing inadvertent exposure from improper personal protective equipment removal, they say that health care workers are generally aware of and are using proper precautions.

For example, treatment sites in Africa administered by Médecins Sans Frontières, a medical humanitarian organisation, have established a systematic process to mitigate the risks associated with removal of personal protective equipment, including a buddy system in which health care workers walk each other through each step of the removal process to help ensure safety.

Johns Hopkins Office of Critical Event Preparedness and Response (CEPAR), in collaboration with Perl, has established a number of clinical guidelines and tools to ensure Johns Hopkins hospitals, outpatient clinics and primary care offices take adequate precautions when encountering patients who have had a history of recent travel to West Africa.

Such precautions include proper procedures for the donning and doffing of PPE for any patient identified as having such a travel history and who has symptoms associated with Ebola.

“Despite its lethal nature, Ebola transmission can be interrupted with simple interventions and by focusing on basics. Improvement in basic health care infrastructure and providing an adequate supply of personal protective equipment, along with a ritualized process for donning and doffing personal protective equipment, are desperately needed to prevent further unnecessary infection and loss of life among the heroic health care workers who are on the front lines of this war,” the authors write in the commentary.

Perl is senior epidemiologist for the Johns Hopkins Health System and a consultant to the CEPAR, which is overseeing and coordinating Johns Hopkins’ readiness for any potential Ebola patient. Hynes is the director of the Geographic Medicine Center in the Division of Infectious Diseases.