A) mosquito bite
B) tick bite
C) saliva and secretions from the nose
D) contaminated food and water
Correct Answer: D
Solution :
Polioviruses are more stable than most other viruses and can remain infectious for relatively long period in water and food. The primary mode of transmission is ingestion of water contaminated with feces containing the virus. Ifs primary area of multiplication are the throat and small intestine. Next the virus invades the tonsils and the lymph nodes of the neck and ileum. From the lymph node the virus enters to blood and by penetrating the capillary walls enters the central nervous system. The virus displays high affinity for particularly motor nerve cells and multiplies within the cytoplasm of motor nerve cells, hence, the cell die and results paralysis.
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