Which of the following is the BEST example of herd immunity?
A. A child infected with measles travels from Germany to the United States. Several babies contract the disease, but the outbreak is largely contained due to vaccinations.
B. Certain populations of cattle are less susceptible to infection with encephalitis because of their genetic makeup.
C. Once a certain threshold of individuals has been infected with a novel human pathogen, it is unlikely that any more will be.
D. Geese and chickens are infected with different strains of influenza because they express different receptors on their cell surface.
E. When infection spreads through a population, certain individuals generate stronger immune responses than others.
A. A child infected with measles travels from Germany to the United States. Several babies contract the disease, but the outbreak is largely contained due to vaccinations.
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The combining form that means medulla oblongata is ________.
Fill in the blank(s) with the appropriate word(s).
Why are red blood cell transfusions not rejected in the same way that transplanted tissues are?
A) Mature red blood cells do not express MHC Class I. B) Mature red blood cells do not express MHC Class II. C) Refrigerator storage of red blood cells inactivates both MHC Class II and I. D) MHC Class I molecules are unstable on red blood cells once they are removed from the body. E) MHC Class II molecules are unstable on red blood cells once they are removed from the body.
The abbreviation for chest x-ray is ________
Fill in the blank(s) with correct word
Diagnosis of hydronephrosis is confirmed by:
A) IVP. B) pyelogram. C) cystogram. D) cystoscopy.