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immune system

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immune systemOnline version

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by Martha Vivas
1

Pathogens harmful bacteria pathogen white environment immune disease blood 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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