Answers

2015-10-20T10:40:26+05:30
I will suggest that they are of many types the one is the communicable ones that spread from one person to another. that is because of flow of microbes from the infected person. through different kinds of transmitters like air water and insects they affect our healthy microbes that results in ill functioning of the body that is known commonly as- "You fell ill"...

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2015-10-20T15:48:35+05:30
Especially because of our immune system when WBC be come weak we get ill bcoz out immune system fight against desiases by make anti bodies
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