Which response usually occurs after an individual receives a vaccination for the influenza virus?
A. hormones in the blood stop reproduction of the virus
B. pathogens from the vaccine deactivate the virus
C. enzymes released from antigens digest the virus
D. antibodies against the virus are found in the blood
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Parasitic strains of E. coli may produce poisonous chemicals that attack living tissue and cause disease in humans. These chemicals are called
A. antibodies
B. toxins
C. viruses
D. antibiotics
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