Which of the following statements is true regarding peussis ?

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