MasteringMicrobiology – Ch. 24 HW – Flashcards

Which of the following components of the immune system would likely be involved in the regression of a wart? a. T cells b. complement proteins c. B cells d. antibodies

Which of the following are symptoms of influenza infection? Select all that apply. a. muscle pain b. headache c. diarrhea d. fever

Which of the following statements regarding antigenic shift are true? Select all that apply. a. Antigenic shift results in a major change in the genetic composition of the virus. b. Antigenic shift results from frequent mutations that occur during replication of the RNA genome. c. Viral strains resulting from antigenic shift contain RNA segments from different species. d. Little immunity to virus strains resulting from antigenic shift exists in the population. e. Antigenic shift results in relatively minor changes in the neuraminidase (NA) and hemagglutinin (HA) antigens.

Predict which of the following are reasonable outcomes of the cytokine storm during the 1918 flu pandemic. Select all that apply. a. increased mortality in elderly people b. an enhanced immune response to influenza c. less severe symptoms associated with the infection d. an excessive inflammatory response leading to extensive tissue damage e. increased fluid in the lungs and labored breathing

What are some of the current challenges to production of the influenza vaccine? Select all that apply. a. The virus undergoes antigenic changes on a regular basis. b. The production of vaccine is a lengthy process. c. Production is difficult because the vaccine is composed of all important strains identified during the previous flu season. d. The vaccine does not stimulate a strong antibody response because it is an intracellular pathogen. e. In order to yield a vaccine, the virus must be produced in eggs.

Predict which of the following would be outcomes of treatment with Tamiflu. Select all that apply. a. overall decrease in the replication rate of influenza b. decreased ability of influenza to attach to host cells c. a decrease in the release of viral particles from the cell d. decreased production of the NA protein by the host cell e. an increase in the ability of the immune system to combat the infection

Why are poxviruses frequently used in vaccinations and gene therapy? a. They can last outside the body for a very long time. b. They are large viruses that make useful vectors. c. They are not enveloped, so they are easy to manipulate. d. They can infect many different types of species.

Smallpox (Orthopoxvirus variola) is the first human disease considered to be globally eradicated. All of the following factors played a huge role in its eradication EXCEPT for __________. a. the removal of animal reservoirs in nature b. rapid diagnosis due to obvious signs and symptoms c. the existence of an inexpensive, effective vaccine d. the fact that there are no asymptomatic carriers, so the disease is always diagnosable