Understanding Infections: How Pathogens Invade the Body

An infection occurs when disease-causing microorganisms — bacteria, viruses, fungi, or parasites — enter the body, multiply, and damage tissues. Entry routes include the respiratory tract, digestive tract, broken skin, and direct contact with infected individuals or animals.

Infections range from mild and self-limiting to severe and life-threatening. Understanding transmission mechanisms and pathogen types is essential for effective prevention (hygiene, vaccination, vector control) and timely treatment (antimicrobials, supportive care).