Question

Name two bacterial diseases which spreads due to
A. Air
B. Contaminated food

Answer 1

Hint: Bacterial infections are cured only by the uptake of antibiotics whereas viral infections can be cured without taking any medicine. And they can spread by coming in touch with infected organisms.

Complete answer:
The bacteria which are spread by the mode of air is generally because of coming in the proximity of an infected person or by using any object or thing which has been already used by an infected person. The airborne bacteria are generally found in the respiratory tract and generally cause infections related to respiration only. So, whenever an infected person sneezes or spits then these bacteria are introduced into the air and the healthy person if comes in a range of these bacteria then he has chances of getting infected if the immunity against a particular disease has been developed or not. These air-borne bacteria go on spreading from person to person until the community has reached a point of herd immunity where the 1/3rd people have been already affected and cured of the disease. The example of two airborne diseases as tuberculosis and diphtheria.
The diseases which are spread by eating the contaminated food is because the pathogen is already residing in the body of the organism or the thing which we have eaten prior to getting the disease. The food-borne disease can also be caused if the food is washed with the contaminated water and the causing bacteria have somehow stuck to the food. The disease-causing bacteria cannot directly enter into the host so it takes a two-step process in which it makes food as its primary host and with the help of that food it gains entry into the secondary host which is humans. The common example of foodborne disease is listeriosis and diarrhea. The food-related bacteria target the digestive tract.

Note:
There are many more infections that occur on a regular basis among humans due to temperature changes but they are generally viral infections because the virus comes into action at a specific temperature.