Which disease is not transmitted by mosquitoes?

Given below are a few situations:
$(i)$ Geeta of Class $IX$ was having a common cold. She sits with Sarika,who also develops the disease.
$(ii)$ Animesh of Class $IX$ shifted to a new residence with his family where a water purification system has not been installed yet. He develops Cholera and Dysentery.

List three harmful effects of infectious disease.

Vectors can be defined as:

Which of the following can make you ill if you come in contact with an infected person?

Viruses,which cause hepatitis,are transmitted through