Infectious diseases caused by microorganisms can spread through
I. body contact
II. air
III. Vector

Options

A. I and II
B. I and III
C. II and III
D. I,II and III

Answer

D

Explanation

Microorganisms that cause diseases multiply inside host body rapidly. They can be present in discharges of the infected person including nasal discharges, oral discharges and even stools. When a person sneezes, they come out into air in the form of droplets and can infect other healthy person by entering his body through air breathed in. They can also transmit through body contact and through a vector.