In a epidemic of poliomyelitis, the best way to stop spread is by -: (A) Injection of killed vaccine, (B) OPV drops to all children, (C) Isolation of cases, (D) Chlorination of all wells
Answer is B. - within an epidemic area, OPV should be provided for all persons over 6 weeks of age who have not been completely immunised or whose immune status is unknown. - OPV offers herd immunity and this propey is used in controlling epidemic. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:208 <\p>