<prompt> Which of the following statements is true regarding pertussis -Neurological complication rate of DPT is 1 in 50000Vaccine efficacy is more than 95Erythromycin prevents spread of disease between childrenThe degree of polymorphonuclear leukocytosis correlates with the severity of cough  <response>: Pertussis Whooping Cough:Leukocytosis does not correlates with the severity of coughDrug of choice: Erythromycin 40 mgkg QID X 10 daysVaccines:DPT:i. Killed acellular bacilli 20,000 million per dose 0.5 mlii. Pertussis component leads to neurological complications after 2 years of age 1 per 1,70,000 vaccineesiii. Vaccine efficacy is 50 60 2 doses and 70 3 dosesPertussis killed whole cell vaccineDOC for cases and contacts: Erythromycin for 10 days 