For example, Chen found that the weight of mice was significantly lower than that of a control group after 7 days of nasal drip of environmental particles collected from a pigsty, and the weight showed a trend of first decreasing and then increasing during the test ( 59 ).
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Research progress on distribution and exposure risk of microbial aerosols in animal houses.
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The sentences
The concentration of microbial aerosols showed an increasing trend with the deterioration of sanitary conditions in the duck house.