Vaccines and Immunization

Infection and Immunity

The invasion of foreign organism on a host body for its growth and multiplication is termed as infection. The infection can lead to infectious diseases/ transmissible disease/ communicable disease. The infection can be caused by any infectious agents and their toxins causing several immune reactions like allergy, inflammation etc. Immune or allergic reactions arise upon infection due to the role of Host immune system to maintain immunity in the body. The infectious agents may be bacteria, virus, fungus, parasites, protozoans etc. As the agents vary, so does the route of transmission to enter into the host body and also the diseases, diagnosis and treatments.