Infectious diseases are caused by pathogenic microorganisms like bacteria, viruses, fungi, or parasites.

They can spread from person to person through direct contact, contaminated surfaces, or vectors like mosquitoes.

Common examples include influenza, COVID-19, malaria, tuberculosis, and HIV/AIDS.

Symptoms vary depending on the disease but may include fever, cough, fatigue, and body aches.

Prevention strategies often involve vaccination, good hygiene practices, and avoiding exposure to infected individuals.

Prompt diagnosis and treatment are crucial for controlling infectious diseases and preventing their spread within communities.