Infectious diseases are caused by pathogenic microorganisms such as bacteria, viruses, fungi, and parasites.
Examples of infectious diseases:
- Bacterial: Tuberculosis (caused by Mycobacterium tuberculosis).
- Viral: Influenza (caused by the influenza virus).
- Fungal: Athlete's foot (caused by fungi).
- Parasitic: Malaria (caused by Plasmodium parasite).