Question

Question 2
What are the different means by which infectious diseases are spread?

Answer 1

The different modes of transmission of infectious diseases are:
$\to$ Through Air: Certain disease-causing micro-organisms are expelled in air by coughing, sneezing, talking, etc. These micro-organisms can travel through dust particles or water droplets in air to reach other people. For example, tuberculosis, pneumonia, etc. spread through air.
$\to$ Through Water: Sometimes causal micro-organisms get mixed with drinking water and spread water borne diseases. Cholera, for example, is water borne disease.
$\to$ Through Sexual Contact: Sexual act between two people can lead to the transfer of diseases such as syphilis, gonorrhoea, AIDS, etc.
$\to$ Through Vectors: Certain diseases spread by other animals called vectors. For example mosquitoes spread malaria.