1. Contagious diseases are such that spread from one person to another directly and knowingly. Their germs are so strong, that disease of one is sure to reach the other.
2. Contagious diseases are caused by coming in contact with the patient directly.
3. Caused by germs and viruses.
4. Contagious, hence easily containable.
1. Diseases that spread from one man to another, but without the direct knowledge of the person who is suffering from a particular disease, are called infections diseases.
2. Infectious diseases are caused indirectly by water, air, food, or some other environmental influences.
3. Caused by a specific bacterium or virus.
4. Infectious and may take epidemic form, hence difficult to control/contain.