<prompt> True about diphtheria are all except:Incubation period-2 to 5 daysChemoprophylaxis is done with rifampicinPreviously immunized asymptomatic household contacts should receive booster doseChild with diphtheria is given antitoxin  <response>: Ans. B. Chemoprophylaxis is done with rifampicina. Erythromycin for 10-14 days is used for prophylaxis.b. A child with diphtheria is treated with anti-toxin as soon as possible.c. Equine derived Antitoxin: 20,000-1,00,000 units IM or IV. is used 