<prompt> Which of the following statements is true regarding peussis -Neurological complication rate of DPT is I in 50000Vaccine efficacy is more than 95Erythromycin prevents spread of disease between childrenThe degree of polymorphonuclear Leukocytosis correlates with the severity of cough  <response>: Erythromycin prevents spread of disease between children leucocytosis does not correlates with the severity of cough. Drug of choice : Erythromycin 40mgkg QID for 10 days Vaccine:DPT Drug of choice for cases and contacts:Erythromycin for 10 days. Reference:Park;s textbook of preventive and social medicine,K.Park,23rd edition,page no:163-65. p 