Discussion
The primary mode of transmission for spread of polio virus is :
Answer: A
Polio spreads mainly by Ingestion (Oral-fecal) route.
Poliovirus is an enterovirus. It is shed in large amounts in the faeces of infected people and spreads through contaminated water, food and hands. It multiplies first in the throat and intestine and, in a small fraction of infections, invades the nervous system to cause paralysis. The oral polio vaccine works by imitating this route, producing gut immunity.
Respiratory droplets play a minor role early in infection, when the virus is in the throat, but they are not the primary route. Polio is not sexually transmitted, and blood transfusion is not a recognised route of spread.
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