Leptospirosis is a potentially fatal zoonosis that is mostly
occurs in heavy rainfall, ooded and poor sanitisation areas
. In west Bengal specially in Kolkata, there is high average
rainfall with water holding capacity of soil [9]. As rodents like
rats ,livestock and pets are reservoir for leptospires, their urine
containing leptospires can contaminate the water by which
humans get infected either by direct or indirect exposure to
this contaminated water. Rats are main hosts of serovar
Icterohaemorrhagiae, cattle of Hardjo and Pomona, pigs of
Pomona or Tarrossovi, and dogs of Canicola[10]. On the other
hand people living in urban slum encirclement with
inadequate sanitation are at high risk of rat exposure and
leptospiros is .Farmers , Sewage workers , Miners ,
Veterinarians and individuals who are involved in Water
sports, Gardening, Ecotourism are at high risk for
leptospirosis [11,33,61]. These occupations involve activities
likely to result in exposure of wounds, cuts and to soil and
water contaminated with the urine containing leptospire of
rodents and animals from which workers get infected .All
these above points are crucial reasons for the cases of
leptospirosis in Kolkata.