Incubation period of typhoid-
<p> Typhoid fever:- Typical continuous fever for 3-4 weeks,relative bradycardia with involvement of lymphoid tissue. Without effective treatment, typhoid kills over 10% of those infected. Causative agent- Salmonella typhi. S.paraA and S.paraB are infrequent. Reservoir- man Case - a case is infectious as long as bacilli appear in stools /urine. Carriers:- 1. Convalescent carriers-excrete bacilli for 6-8 weeks,after which their number dimnishes rapidly. 2. Chronic carriers- persons who excrete bacilli for more than a year after a clinical attack. In most chronic carriers,the organism persists in gall bladder and in biliary tract. Source of infection- faeces and urine of cases/carriers. Age group involved mostly is 5-19 yrs old. Males affected more than females. Incubation period- 10-14 days. Mode of transmission: faecal oral route/ urine oral routes. Treatment of carriers:- Intensive course of ampicillin/ amoxycillin (4-6g/day) together with probenecid for 6 weeks. {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.235}</p>
3-20 days
14-45 days
5-10 d ays
15-60 days
Communicable diseases