Most people realize they are sick at the prodromal stage.
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Q41: Which of the following is a bacterial
Q42: Communicable diseases are caused by pathogens.
Q43: Vectors and vehicles are examples of direct
Q44: A portal of exit is necessary to
Q45: During incubation, a person experiences early symptoms
Q47: The immune system guards against pathogens.
Q48: White blood cells are known as antigens.
Q49: The two types of leukocytes are phagocytes
Q50: A person develops active immunity when antibodies
Q51: Passive immunity is long-lasting.
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