<prompt> A case of acute flaccid paralysis must be observed for how many days for residual weakness -30 days42 days60 days90 days  <response>: - AFP surveillance is done in all children below age of 15 years. - at least 80 of the AFP cases should have a follow up examination of residual paralysis at 60 days after the onset of paralysis. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:204 p 