👉 The Harvard definition of "infection" refers to the process by which a pathogen, such as a bacterium, virus, fungus, or parasite, invades and establishes itself within a host organism, leading to disease. This involves the pathogen's ability to adhere to, penetrate, and replicate within host cells or tissues, often evading the immune system's defenses. The infection can result in various symptoms and complications, depending on the type of pathogen and the affected body systems. For instance, bacterial infections might cause inflammation and tissue damage, while viral infections can lead to cellular dysfunction and organ failure. Understanding the mechanisms of infection is crucial for developing effective treatments and preventive measures, such as antibiotics, antivirals, and vaccines.
