More Frequent Cases of Severe C

question 39

Multiple Choice

More frequent cases of severe C. difficile infection since 2003 is attributed to

• A) the emergence of more virulent and toxigenic strains.
• B) the increased use of probiotics.
• C) problems with hospital hygiene and increased transmission.
• D) dietary changes in the human population.

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Definitions:

Alleles

Different forms of a gene that arise by mutation and are found at the same place on a chromosome.

Type AB Blood

A blood type in the ABO blood group system characterized by the presence of both A and B antigens on the surface of red cells.

Homozygous Varieties

Organisms that possess two identical alleles for a specific gene or trait.

Dominant

Refers to an allele that masks the effect of a recessive allele paired with it in heterozygous individuals.