Infectious disease

Infectious diseases also known as transmissible disease or communicable disease, from an infection and caused by pathogenic microorganisms such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies, normally harmless or even helpful but some organisms may cause diseases resulted in 9.2 million deaths in 2013 (about 17% of all deaths). Specific medications used to treat infections include antibiotics, antivirals, antifungals, antiprotozoals, and antihelminthics.