👉 Infection occurs when a pathogen, such as a virus, bacterium, fungus, or parasite, enters and takes control of a host's body cells, disrupting normal physiological functions. One primary argument for understanding infection is that it highlights the body's vulnerability to external threats. Pathogens can exploit weaknesses in the immune system, leading to disease. For instance, viruses often hijack cellular machinery to replicate, causing cell damage and triggering immune responses. Another key point is that infections underscore the importance of preventive measures like vaccination, hygiene, and antibiotics, which help mitigate the spread and severity of diseases. Additionally, studying infections provides insights into the evolution of pathogens and the development of resistance, informing public health strategies and medical treatments.
