True about the epidemiology of influenza: (A) Incubation period 10-12 hrs, (B) Extra human reservoir not seen, (C) Pandemics occur, (D) Asymptomatic see rarely
Answer is C. The incubation period is 18-72 hours.Major reservoir of influenza viruses exists in animals and birdsOccur in pandemics every 10-40 years.During pandemics, attack rates tend to be high 5-10% in adults, 20-30% in children.Infects all ages and sexes. Park 23e pg: 147