In Two Communities of Similar Size and Age Structure (A

question 28

Multiple Choice

In two communities of similar size and age structure (A and B) , there were outbreaks of viral illnesses (virus A in community A, and virus B in community B) , both of which were traced back to a single source. Exposure to these viruses in each community confers permanent immunity. In community A, 200 susceptible people were exposed to an index case, 150 people were infected (not including the index case) , 75 people became ill, and 40 people died. In community B, pathogenicity was 40%, infectivity was 90%, and virulence was 60%. Which virus had the greatest infectivity?

• A) Virus A
• B) Virus B
• C) Both A and B were equal in infectivity.

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Definitions:

Protist

Any member of a group of diverse eukaryotic, mostly unicellular organisms, including algae, amoebas, and many others.

Late Blight

A serious disease of potatoes and tomatoes caused by the oomycete Phytophthora infestans, leading to significant crop loss.

Phytophthora

A genus of plant-damaging oomycetes, commonly referred to as water molds, responsible for a range of plant diseases.

Axopods

Long, thin extensions of certain protozoans, such as those in the phylum Actinopoda, used for feeding and movement.