Q. Consider the following statements:
1.Polioviruses are mainly spread through the faecal-oral route.
2.The oral polio vaccine (OPV) contains a live but weakened virus that is used to immunize people against polio.
3.The Indian government does not consider vaccine-associated paralytic poliomyelitis (VAPP) to be polio.
Which of the statements given above are correct?
Answer: D
Notes:
Explanation –
Statements 1, 2 and 3 are correct. Polioviruses are primarily transmitted through the fecal-oral route. The OPV contains a live, attenuated (weakened) virus, which is used for immunization against polio. The weakened virus stays in the intestines for a short time and is then excreted in the stool. In very rare cases, the virus can change (or mutate) and regain its ability to cause the disease. When this happens, it’s called vaccine-derived poliovirus (VDPV). The Indian government does not consider vaccine-associated paralytic poliomyelitis (VAPP) to be polio because these cases happen infrequently and do not pose much risk to other people.
Source: The Hindu
