United States healthcare providers are concerned about a possible pandemic of avian flu because
A. there is no vaccine currently available.
B. it is caused by a group of viruses that mutate very easily.
C. the causative virus is being spread around the world by migratory birds.
D. all of the above.
United States healthcare providers are concerned about a possible pandemic of avian flu because
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United States healthcare providers are concerned about a possible pandemic of avian flu because
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