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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Polio virus is shed in stool up to -
assistant
The correct answer is  - 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 : Park's textbook of preventive and social medicine, 23rd edition, pg no:205 <\p>