Parasitic worms tend to be within a small geographic range.

Infection symptomatic progression progresses _____.

Targets of physical and chemical agents may include the cell wall, membrane, protein and nucleic acid synthesis and _____.

Ionizing radiation has deep penetrating power.

Virulence is ____.

Soil may be considered as having biotic and abiotic components.

A communicable disease may infect immuno-compromised as well as normal patients.

The mortality rate is ___.

A mutated bacteria is known as a mutant strain.

Viruses become incorporated and remain latent during the _______.