👉 Extraction-infection is a process where pathogens, such as bacteria, viruses, or parasites, are drawn from their environment into a host organism, typically through mechanisms like ingestion, inhalation, or direct contact. Once inside, these pathogens can multiply and cause infection by disrupting normal cellular functions, evading the host's immune defenses, or producing toxins. The infection occurs when the pathogen establishes itself in the body, leading to symptoms and potential disease if the host's defenses are not effective enough to control the invasion. This cycle of extraction and infection is fundamental to understanding how many diseases spread and persist.
