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United States healthcare providers are concerned about a possible pandemic of avian flu because

Posted: Thu Jul 21, 2022 9:14 pm
by answerhappygod
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.