The dissemination of microbial aerosols to a suitable portal of entry, usually the respiratory tract, is called:

Correct option is C

Ans. (c) Sol. The correct answer is (c) Air-borne.
Air-borne transmission occurs when microorganisms are dispersed in the air in the form of aerosols, which can then be inhaled by individuals, leading to infection. This method of transmission is typical for respiratory diseases such as tuberculosis, the common cold, and influenza.
Explanation of each option:
· (a) Vector-borne: This type of transmission occurs when an insect or another organism (the vector) carries the pathogen from one host to another. Examples include malaria (transmitted by mosquitoes) and Lyme disease (transmitted by ticks).
· (b) Vehicle-borne: Vehicle-borne transmission involves the indirect transmission of pathogens through contaminated surfaces or objects, such as food, water, or fomites (e.g., towels or doorknobs).
· (c) Air-borne: Correct answer. Airborne transmission involves the spread of pathogens through the air, typically via droplets or aerosols that can be inhaled into the respiratory tract, causing respiratory infections.
· (d) Water-borne: Water-borne transmission refers to diseases transmitted through contaminated water, such as cholera or dysentery.
Thus, air-borne transmission refers to the spread of microbial aerosols through the air to the respiratory tract.