Infectious diseases are disorders caused by organisms such as bacteria, viruses, fungi or parasites. Some infectious diseases can be passed from person to person. These infectious organisms are known as pathogens.
Tuberculosis (TB) is a disease caused by bacteria called Mycobacterium tuberculosis. The bacteria usually attack the lungs, but they can also damage other parts of the body. TB spreads through the air when a person with TB of the lungs or throat coughs, sneezes, or talks. Hence, Tuberculosis is an infectious disease caused by bacteria whereas diabetes, goiter, and hypertension are not caused by any of the infectious organisms.
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