期刊
ANNALS OF WORK EXPOSURES AND HEALTH
卷 67, 期 8, 页码 1004-1010出版社
OXFORD UNIV PRESS
DOI: 10.1093/annweh/wxad033
关键词
airbourne dust; antimicrobial resistance; electrostatic dust collectors; MRSA; occupational exposure; pig farms; respiratory exposure
This study compares two sampling methods for measuring airborne MRSA in the farm environment and finds that both passive dust sampling with electrostatic dust fall collectors and active inhalable dust sampling using stationary air pumps with Teflon filters can detect MRSA. The study suggests that electrostatic dust fall collectors can be used as an affordable and easily standardized method for quantifying airborne MRSA levels in pig farms.
Methicillin-resistant strains of Staphylococcus aureus (MRSA) are resistant to most beta-lactam antibiotics. Pigs are an important reservoir of livestock-associated MRSA (LA-MRSA), which is genetically distinct from both hospital and community-acquired MRSA. Occupational exposure to pigs on farms can lead to LA-MRSA carriage by workers. There is a growing body of research on MRSA found in the farm environment, the airborne route of transmission, and its implication on human health. This study aims to directly compare two sampling methods used to measure airborne MRSA in the farm environment; passive dust sampling with electrostatic dust fall collectors (EDCs), and active inhalable dust sampling using stationary air pumps with Gesamtstaubprobenahme (GSP) sampling heads containing Teflon filters. Paired dust samples using EDCs and GSP samplers, totaling 87 samples, were taken from 7 Dutch pig farms, in multiple compartments housing pigs of varying ages. Total nucleic acids of both types of dust samples were extracted and targets indicating MRSA (femA, nuc, mecA) and total bacterial count (16S rRNA) were quantified using quantitative real-time PCRs. MRSA could be measured from all GSP samples and in 94% of the EDCs, additionally MRSA was present on every farm sampled. There was a strong positive relationship between the paired MRSA levels found in EDCs and those measured on filters (Normalized by 16S rRNA; Pearson's correlation coefficient r = 0.94, Not Normalized; Pearson's correlation coefficient r = 0.84). This study suggests that EDCs can be used as an affordable and easily standardized method for quantifying airborne MRSA levels in the pig farm setting.
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