Why Diseases Are Caused?

Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They're normally harmless or even helpful. But under certain conditions, some organisms may cause disease.

What are causes of diseases Class 9?

Immediate cause: The organisms that enter our body and cause the disease are termed as an immediate cause. For example, virus, bacteria, protozoa etc. Contributory cause: The secondary factors which led these organisms enter our body are termed as a contributory cause.

What are the causes and capable causes of disease?

Microorganisms that are capable of causing disease are called pathogens.