< b>Level 4 biosafety: The highest level of biosafety. This level is used
for the diagnosis of exotic agents such as the Ebola virus that pose a high risk
of life-threatening disease, which may be transmitted by the aerosol route and for
which there is no vaccine or therapy.
A biosafety level is a specific combination of work practices, safety equipment,
and facilities which are designed to minimize the exposure of workers and the environment
to infectious agents.
The 4 standard biosafety levels are:
Level 1 -- This level applies to agents that do not ordinarily cause human
disease.
Level 2 -- This level is appropriate for agents that can cause human disease,
but whose potential for transmission is limited.
Level 3 -- This level applies to agents that may be transmitted by the respiratory
route which can cause serious infection.
Level 4 -- This level is used for the diagnosis of exotic agents that pose
a high risk of life-threatening disease, which may be transmitted by the aerosol
route and for which there is no vaccine or therapy.
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