HSC 305 Epidemiology Exam 2 Questions
And Answers
What are the characteristics of a person? - Answer-Age, sex, marital status, ethnicity/race,
religion, socioeconomic status, nativity/migration
What are the characteristics of time? - Answer-cyclical fluctuations, point epidemics, secular
time ...
What is the epidemiological triangle? - Answer✔✔-Explains etiology of infectious diseases. Host
> agent > Environment >
What are the microbial agents of infectious disease? - Answer✔✔-Bacteria, viruses, rickettsia,
mycoses, protozoa, helminths, arthropods
Bacteria - Answer✔✔-Once were the leading killers, but now are controlled by antibiotics.
Remain significant causes of human illness.
Ex. Salmonellosis and tuberculosis
Viruses - Answer✔✔-A microorganism composed of a piece of genetic material (RNA or DNA)
surrounded by a protein coat. To replicate, a virus must infect a living organism.
Ex. Hepatitis A, herpes, influenza
Rickettsia - Answer✔✔-A subdivision of bacteria that can grow within cells. Ectoparasites (fleas,
ticks, lice, flies) transmit the majority of rickettsial agents, which cause a variety of diseases.
Ex. can produce typhus fever, Q fever, rocky mountain spotted fever.
Mycoses (fungal diseases) - Answer✔✔-Causes diseases such as coccidioidomycosis, ringworm,
and athlete's foot. Opportunistic mycoses infect immunocompromised patients.
protozoa - Answer✔✔-Microscopic single-celled organisms. Responsible for diseases, such as
malaria, amebiasis, babesiosis, cryptosporidiosis, and giardiasis.
Ex. malaria is transmitted by mosquitos in endemic areas.
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