This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Which of the following statements is true regarding peusis? 
Select and explain. 
A. Neurological complication rate of DPT is I in 50000, B. Vaccine efficay is more than 95%, C. Erythromycin prevents spread of disease between children, D. The degree of polymorphonuclear Leukocytosis correlates with the severity of cough
C: Erythromycin prevents spread of disease between children
Answer: C: Erythromycin prevents spread of disease between children 
Explanation: Neurological complications of DPT vaccine is due to peussis component. The estimated risk is 1: 170000 doses administered. Vaccine efficacy is 85%. Although several antibiotics are effective against B.peussis, erythromycin is the drug of choice Reference : Park&;s Textbook of preventive and social medicine, 24th edition.Pg no.174