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Bacteria help to build immunity to diseases, they help to develop medications like penicillin, and they help to ferment food and drink.
You can be born with them or they can develop later in life such as after puberty.
catiminatd food or water
Pathogens
Although one cannot be completely immune to salmonella, humans can develop resistances against it. Whether you get sick or not from eating foods infected with salmonella depends upon your bodies inherent and developed resistance against it and the strain of salmonella in the food you are consuming.
ecolie
by taking proper balanced diet food.
Proper cleaning and sanitation
Contamination.
cleaning and sanitizing
Yes. Anything that comes into our bodies MAY contain pathogens.
if they have lice and scratch their head lice will get in the food;)