Question

23. Which of the following is true regarding disease

A. Every exposure to a pathogen results in colonization

B. Indirect contact transmission of a pathogen requires a portal of entry

C. All subclinical diseases are chronic diseases

D. The incubation period of disease is when intermittent common source spread occurs

Answer 1

Ans 23) the correct option is B.

Indirect contact transmission occurs when there is no direct human to human contact whereas the contaminant or infectious agent enters the body of the host via portal of entry which is a site through which microorganisms enter the body of the host and cause the disease even without coming in direct contact. Portal of entry can be skin, respiratory as well as gastrointestinal tract. In this case, the infectious agent comes in contact with these portal of entry through various means such as contaminated surface or objects and also through vectors such as mosquitoes, etc.