Fill in the Blanks immune systemOnline version concepts 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 .