Hi Dr Andrew, hoping for your best health to give give us healthy advices. i am syed from pakistan and would like to ask questions about Oral Polio Vaccine (OPV). Nowadays in our area the govt is administering these OPV vaccines after every 10 to 15 days, is this safe for our children. As per WHO guidelines multiple doses can be given only in hot areas and our area is not hot now it is winter here and also as per who guild lines these opv remain in the intestine for about 4 to 6 week then what could be the reason for this multiple and so frequent doses. looking forward to your kind response regards syed ali