Vectors can be defined as

$A$ rabid dog was seen in a colony and everyone was afraid of going near to it. Name the disease and state how this disease is transmitted. The dog is presently considered the reservoir of the disease. What is the meaning of 'reservoir' here? What steps should the Government take to prevent the spread of the disease?

Viruses,which cause hepatitis,are transmitted through

Write the cause,symptoms,and prevention of $AIDS$.

Define an infectious disease. Give any one example of it.

Bacterial diseases are: