Compléter immune systemVersion en ligne concepts par Martha Vivas 1 Pathogens environment disease harmful pathogen immune white blood bacteria fungi An infection occurs when a virus or a bacteria ( the ) enters another organism ( the host ) and , to sustain itself , replicates inside the host . In cases , this contact causes . . Infectious diseases are produced by agents that are in the , such as , viruses , parasites , or . are microscopic disease agents that are to other living organisms . The cells , also known of the main components of the system .
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