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Information on the Survivability of the Ebola Virus in Medical Waste

11/24/2014

 

Background

The Ebola virus is an “enveloped virus”; meaning, the core of the virus is surrounded by a lipoprotein outer layer. Enveloped viruses such as Ebola are more susceptible to destruction with a number of physical and chemical agents than viruses without lipoprotein envelopes (Figure 1).

For the purposes of this document, any waste generated in the care of patients with known or suspected Ebola is considered a Category A infectious substance.

Physical Agents/Heat

Physical agents that can eradicate Ebola virus include heat, sunlight, ultraviolet light, E-Beam, and Gamma Rays.1

Killing Ebola virus on materials it is suspected to be on or attached to can done by heating:

  • To 60°C (140°F) for 60 minutes;
  • To 72-80°C (162° - 176°F) for 30 minutes; or
  • Submersing the material in boiling water for five minutes.2

This can be achieved by submitting materials suspected of being contaminated with Ebola to treatment in an autoclave under a “validated waste cycle” to 121°C (250°F) for at least 30 minutes depending on the load and packaging, which is more than enough heat and time to kill the virus. Autoclave runs should include a process control to show that the cycle was performed effectively. The Autoclave cycles should be checked at some frequency with biological indicator (spores) as a quality assurance measure to show that the waste cycles is achieving desired results.

Other heat treatments include incineration. Incinerators run at extremely high temperatures, well above the relatively low temperatures needed to kill Ebola virus. Incineration would be the best method for large or bulky items, such as mattresses. Incineration that reduces waste to ash at any temperature kills Ebola virus.3 The ash produced via incineration is NOT hazardous with respect to microbial pathogens.

Chemical Agents

Ebola virus can also be killed by many common chemical agents. Chemical agents that will kill the virus include bleach, detergents, solvents, alcohols, ammonia, aldehydes, halogens, peracetic acid, peroxides, phenolics, and quaternary ammonium compounds.4

Ebola virus can be killed with hospital-grade disinfectants (such as household bleach) when used according to the label instructions. A U.S. Environmental Protection Agency-registered hospital disinfectant with a label claim for a non-enveloped virus (e.g., norovirus, rotavirus, adenovirus, poliovirus) can be used to disinfect environmental surfaces in rooms of patients with suspected or confirmed Ebola virus infection. Please see EPA’s Disinfectants for Use Against the Ebola Virus.

Additional Information

There is limited evidence of Ebola virus transmission through the environment or an inanimate object that may be contaminated during patient care with infectious organisms and serve in their transmission (e.g., bed rails, door knobs, laundry).5 Ebola virus has not been found on surfaces in the absence of visible blood in the patient care environment.6 Frequently touched surfaces should be cleaned and disinfected on a regular basis to help reduce the risk of contact with contaminated surfaces. In addition, spills of biological fluids should be immediately cleaned and disinfected. Disinfectants should also be added to the bagged waste.


Figure 1. Decreasing order of resistance of microorganisms to disinfection and sterilization. Resistant to disinfection sterilization processes---Prions (e.g., Creutzfeldt-Jakob Disease)-Bacterial spores (Bacillus atrophaeus)--Coccidia (Cryptosporidium)--Mycobacteria (M. tuberculosis, M. terrae)--Non-enveloped viruses (polio, coxsackie, norovirus)--Fungi (Aspergillus, Candida)--Vegetative bacteria (S. aureus, P. aeruginosa--Enveloped viruses (Ebola, HIV, herpes, hepatitis B)---Susceptible. Modified from Russell (1998) and Favero (2001).


Contact Information

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