Question

How disease causing microorganisms enter into human beings?

Answer 1

The disease-causing microbes are called pathogens. They enter into the body through –

1. Cuts and wounds in the skin, mouth, or nose.
2. Some pathogens are found in the air and enter into a healthy person by breathing. When a patient sneezes, droplets containing microbes spread into the air.
   Example: Tuberculosis, Flu.
3. Some pathogens enter our body through food and water contaminated with the pathogen.
   Example: Cholera.
4. Pathogens also enter through blood transfusion from an infected to a healthy person.
   Example: Aids