NEET BIOLOGY

Detailed explanation-1: -An infectious disease can be defined as an illness due to a pathogen or its toxic product, which arises through transmission from an infected person, an infected animal, or a contaminated inanimate object to a susceptible host.

Detailed explanation-2: -A communicable disease is one that is spread from one person to another through a variety of ways that include: contact with blood and bodily fluids; breathing in an airborne virus; or by being bitten by an insect.

Detailed explanation-3: -In direct transmission, an infectious agent is transferred from a reservoir to a susceptible host by direct contact or droplet spread. Direct contact occurs through skin-to-skin contact, kissing, and sexual intercourse. Direct contact also refers to contact with soil or vegetation harboring infectious organisms.

Detailed explanation-4: -A pathogen interacts with the host and causes infection, leading to the development of disease in the host. A pathogen may be any harmful microbial agent such as a bacterium, virus, protozoa, fungus or helminth etc.

Detailed explanation-5: -This is the organism (e.g., You or your resident!) that will feel the effects of the infectious disease that has traveled through the chain of infection.