Suppose that some members of a population are infected with a sexually transmitted virus that causes disease X, and some are infected with another sexually transmitted virus that causes disease Y. Some members of the population may be infected with both viruses. While diseases X and Y are similar in that they are both sexually trans- mitted diseases, the disease X is much more harmful to its carriers than the disease Y is to its carriers. Condom use is highly effective in preventing the transmission of either disease. Suppose scientists discover a cure for the sexually transmitted disease X. This cure (a vaccination) will eliminate the virus causing the disease X from its carrier before its carrier can suffer any harm from the virus. Everybody is immediately given this vaccination against the disease X. a What do you expect to happen to the prevalence of the virus causing the dis- ease X in the population? Draw a graph with time on the horizontal axis and prevalence of the virus causing disease X on the vertical axis. b What do you expect to happen to the rate of condom use in the population over time? Add a curve for the rate of condom use to your graph. c What do you expect to happen to the prevalence of the virus causing the disease Y in the population? Add a curve for the prevalence of disease Y to your graph. (Question courtesy of Professor Mikko Packalen, University of Waterloo)
Suppose that some members of a population are infected with a sexually transmitted virus that causes disease X, and some are infected with another sexually transmitted virus that causes disease Y. Some members of the population may be infected with both viruses. While diseases X and Y are similar in that they are both sexually trans- mitted diseases, the disease X is much more harmful to its carriers than the disease Y is to its carriers. Condom use is highly effective in preventing the transmission of either disease. Suppose scientists discover a cure for the sexually transmitted disease X. This cure (a vaccination) will eliminate the virus causing the disease X from its carrier before its carrier can suffer any harm from the virus. Everybody is immediately given this vaccination against the disease X. a What do you expect to happen to the prevalence of the virus causing the dis- ease X in the population? Draw a graph with time on the horizontal axis and prevalence of the virus causing disease X on the vertical axis. b What do you expect to happen to the rate of condom use in the population over time? Add a curve for the rate of condom use to your graph. c What do you expect to happen to the prevalence of the virus causing the disease Y in the population? Add a curve for the prevalence of disease Y to your graph. (Question courtesy of Professor Mikko Packalen, University of Waterloo)
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter37: Immunity
Section: Chapter Questions
Problem 1DAA: Cervical Cancer Incidence in HPV-Positive Women A persistent infection with one of about 10 strains...
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Transcribed Image Text:17 Suppose that some members of a population are infected with a sexually transmitted
virus that causes disease X, and some are infected with another sexually transmitted
virus that causes disease Y. Some members of the population may be infected with
both viruses. While diseases X and Y are similar in that they are both sexually trans-
mitted diseases, the disease X is much more harmful to its carriers than the disease
Y is to its carriers. Condom use is highly effective in preventing the transmission of
either discase. Suppose scientists discover a cure for the sexually transmitted disease
X. This cure (a vaccination) will eliminate the virus causing the disease X from its
carrier before its carrier can suffer any harm from the virus. Everybody is immediately
given this vaccination against the disease X.
a What do you expect to happen to the prevalence of the virus causing the dis-
ease X in the population? Draw a graph with time on the horizontal axis and
prevalence of the virus causing disease X on the vertical axis.
b What do you expect to happen to the rate of condom use in the population over
time? Add a curve for the rate of condom use to your graph.
c What do you expect to happen to the prevalence of the virus causing the disease
Y in the population? Add a curve for the prevalence of disease Y to your graph.
(Question courte sy of Professor Mikko Packalen, University of Waterloo)
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