题目内容

Among non-SPF mice, MHV was present in more than 70% of the reporting institutions, pinworms in about 70%, parvoviruses and ectoparasites in about 40%, and Theiler's murine encephalomyelitis virus in more than ______.

A. 10%
B. 20%
C. 30%
D. 40%

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_______________ animals are generally housed without special precautions to prevent entry of infectious agents. The risk to get infected is higher than for barrier-housed animals, but they are not necessarily infected with many pathogens.

A. Gnotobiotic
B. Conventional
C. Specified pathogen-free (SPF)
D. genetically modified

It is frequently considered less important to monitor for the presence of ___________ agents in conventional animals than in their rederived, barrier-maintained counterparts.

A. aquired
B. wanted
C. unwanted
D. safe

Animal euthanasia is the act of putting an animal to death or allowing it to die by withholding extreme _____________ measures.

A. chemical
B. physical
C. medical
D. biological

TheUSAnimalWelfareActwaspassinAug 24_______.

A. 1955
B. 1960
C. 1966
D. 1970

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