The Leptospira interrogans complex -

Ans. is 'b' i.e., Mostly affects the kidney and liver . The leptospires are generally non pathogenic in reservoir animals (e.g. rodents). . The leptospires mainly infect the kidney and liver. . Vasculitis is responsible for the most impoant manifestations of the disease. . Ig M antibodies appear after one week (not disappear). . No vaccine of leptospira is used world wide. "In pas of the world where the prevalence of human infection in ceain group is high, selective human immunization schemes may be of benifit if suitable vaccine is available"