Question

Epidemiological triad has
a. agent
b. host & environment
c. only a
d. both a & b

Answer 1

Epidemiological Triad has both option a and b that is, it contains both agent, host and environment.

Host and agent are brought together where the disease occurs in the host.

A vector however is an organism that transmits the infection by putting the pathogen from one host to another without even causing the disease by itself but however is a part of the infectious process.

A very classic example that we can site of a vector is that of the Anopheles mosquito. When the mosquito injects the blood from the infected host, it picks up the parasite plasmodiyum.

The parasite isn't harmful for the mosquito, but gets stored in the salivary gland of the mosquito.

The mosquito then transmits the parasite to the next person it bites.