Microbiology Quiz 4 (Exam 3)

Which of the following would be considered a sign of a disease?

a rash

Which of the following would NOT be considered virulence factor(s)?

ribosomes.

Bacteria that resist killing by complement proteins are termed

serum resistant.

Organisms that are found together and interact on a more or less permanent basis are in a relationship termed:

symbiosis.

Opportunists or opportunistic pathogens

take advantage of special circumstances.

A relationship in which one partner benefits and the other is unaffected is termed:

commensalism.

Attributes of an organism that promote pathogenicity are called

virulence factors.

Which of the statements about transmission of pathogens is TRUE?

Droplet transmission is a particularly important source of contamination in densely populated buildings such as schools.

Growth of a parasitic organism in or on the host is referred to as:

infection.

Which of the following is NOT true about the role normal microbiota plays in maintaining host health?

They inhibit the innate immune system.

Adhesins are

involved in the first step of the infectious process AND are often found at the tip of pili.

The infectious dose:

is defined as the number of microbes needed to cause infection.

Which of the following contributes to nosocomial disease?

All of the choices are correct

Explain how the incubation period can influence the spread of an infectious agent.

Depending on the microbe and the illness, an asymptomatic carrier in the incubation period might be shedding infectious microbes to his/her surroundings. In such a case, a longer incubation period would lead to a greater spread of the disease as the carrier comes into contact with more individuals while he/she is generally appearing to be healthy.

Which of the following best defines an endemic disease?

It is a disease that is always present at some level in a population.

The publication of the CDC that reports new cases of reportable infectious diseases is titled

Morbidity and Mortality Weekly Report (MMWR).

The lack of susceptibility to diseases of other species in humans may be due to the

lack of receptors that are recognized by adherence factors.

A fly that walks on feces and picks up E. coli O157:H7 then lands on food and transfers the microorganisms, is considered a

mechanical vector

An infection acquired during hospitalization is referred to as a(n) ______ infection.

nosocomial

A disease-causing microorganism or virus is referred to as a(n)

pathogen