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 peussis - 
Select and explain. 
A. Neurological complication rate of DPT is I in 50000, B. Vaccine efficacy 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: <p> Erythromycin prevents spread of disease between children leucocytosis does not correlates with the severity of cough. Drug of choice : Erythromycin (40mg/kg 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>