Infections are caused by microscopic organisms such as bacteria , viruses and fungi and hence we can’t see them spread .There are billions of harmless micro oragnisms that surround us and we can not identify the dangerous ones.Food, water and the...

Infections are caused by microscopic organisms such as bacteria , viruses and fungi and hence we can’t see them spread .There are billions of harmless micro oragnisms that surround us and we can not identify the dangerous ones.Food, water and the...