The ways by which we can prevent infectious microbes are :-
1.Prevent direct contact with people suffering from infectious diseases.
2.Consume fresh and hygienic food free from any microbe.
3.Drink clean and purified water.
4.Cover your nose when you go in polluted areas which can contain microbes.
5.Cleaning hands frequently before and after meal to prevent any intaking of microbes.
6.Maintain hygiene by bathing everyday. 
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