Which of the following procedures is safe from the production of an aerosol mist?
a. Removing caps from specimen tubes
b. Manual differentials on blood films
c. Filling hemocytometers
d. Centrifuging uncapped specimens
ANS: B
Manual differentials are performed on a dried film of blood that is fixed and then stained, thus rendering any infectious agents nonviable. All other procedures mentioned have the risk of creating an aerosol that may contain viable infectious agents.
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