Hygiene - [A Key to Healthy Life] — Question 1

The manner in which the housefly spreads diseases are:

1. Hairy body and legs pick up the filth — Houseflies have spiny or hairy legs and body that tend to pick up dirt containing germs from germ-infested places such as faecal matter, rotten material, infected wound. When the housefly rests on our food, it rub its legs continuously dropping the particles of filth on the food, causing it to get contaminated.
2. Pouring out saliva — Food is also contaminated with germs when the housefly moistens the foodstuffs by pouring out its saliva on it, or when it vomits (regurgitates) food which it has swallowed from dirty places.
3. Excreta — It deposits its excreta while it feeds and thus contaminates human food.