Rodents, dogs Tick
Species of medical importance in our country
. It causes epidemic or louse-borne typhus and the milder recrudescence form,
Brill-Zinser disease. Clinical Features: It is transmitted by self-inoculation of the organism by scratching after bite by infected louse(Pediculous humanus corporis and pediculous humanus capitis). The illness manifests with sudden onset of fever, headache, malaise, prostration and skin rash.Epidemics of the disease are associated with overcrowding, cold weather, lack of washing facilities and fuel, famine and war.
Brill-Zinser disease (BZD) is recrudescence of infection in persons who have had classical typhus in the past. Early IgG antibodies response rather than IgM antibodies and milder course of the disease is characteristic od BZD due to development of partial immunity