<prompt> Polio virus is shed in stool up to -6 weeks8 weeks10 weeks12 weeks  <response>: - the polio is transmitted by faecal oral route by contaminmates food , water or hands. - in faeces, the virus is excreted as long as 3-4 months. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:205 p 