Organism Salmonella enterica Paratyphi A, B and C. Paratyphi B is the commonest.

Clinical features Paratyphoid is similar to typhoid, but with less systemic effects and diarrhoea a more important feature. A rash is less commonly seen, but when it does occur, it is more extensive involving the limbs and face as well as the body. Ulceration of the gut can occur, but less commonly than in typhoid.

Transmission Infection originates from a carrier or a person with the illness, more commonly food-borne than by other means (see under food poisoning, Section 9.1).

Diagnosis See typhoid.

Incubation period 1-10 days.

Period of communicability 1-2 weeks.

Occurrence and distribution Paratyphoid has a similar distribution to typhoid with an endemic pattern in developing countries and epidemic in developed, but is less commonly detected.

Control and prevention See typhoid. Treatment See typhoid. Surveillance See typhoid.

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