<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>: Ans. is c i.e., Erythromycin prevents spread of disease between children o Efficacy of Peusis Vaccine - repoed to be from 70-90 o Risk of acute encephalopathy - is 1 in 40, 000 cases following DTP vaccine. o Peusis toxin produces Lymphocytosis not polymorphonuclear Leukoctyosis. Leukocytosis due to absolute lymphocytosis is characteristic in late catarrhal or paraoxysmal stage. o Prophylactic erythromycin prevents infecting bacteria to become established - prevents spread of disease - Park 