👉 An infection is a condition where pathogens, such as bacteria, viruses, fungi, or parasites, invade and multiply within a host's body, causing disease. These invaders disrupt normal cellular functions and can lead to various symptoms depending on the type of pathogen and the affected tissues. The immune system responds by mounting an attack to eliminate the invaders, but if the infection persists or is particularly virulent, it can result in tissue damage and illness. Infections can be localized, affecting a specific part of the body, or systemic, spreading throughout the entire organism. Common examples include the flu (viral), strep throat (bacterial), and tuberculosis (fungal). Understanding the nature of infections is crucial for diagnosing and treating diseases effectively.
