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首页> 外文期刊>Applied and Environmental Microbiology >Mechanically Ventilated Broiler Sheds: a Possible Source of Aerosolized Salmonella, Campylobacter, and Escherichia coli
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Mechanically Ventilated Broiler Sheds: a Possible Source of Aerosolized Salmonella, Campylobacter, and Escherichia coli

机译：机械通风的肉鸡棚：气溶胶沙门氏菌，弯曲杆菌和大肠杆菌的可能来源

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This study assessed the levels of two key pathogens, Salmonella and Campylobacter, along with the indicator organism Escherichia coli in aerosols within and outside poultry sheds. The study ranged over a 3-year period on four poultry farms and consisted of six trials across the boiler production cycle of around 55 days. Weekly testing of litter and aerosols was carried out through the cycle. A key point that emerged is that the levels of airborne bacteria are linked to the levels of these bacteria in litter. This hypothesis was demonstrated by E. coli. The typical levels of E. coli in litter were ～108 CFU g?1 and, as a consequence, were in the range of 102 to 104 CFU m?3 in aerosols, both inside and outside the shed. The external levels were always lower than the internal levels. Salmonella was only present intermittently in litter and at lower levels (103 to 105 most probable number [MPN] g?1) and consequently present only intermittently and at low levels in air inside (range of 0.65 to 4.4 MPN m?3) and once outside (2.3 MPN m?3). The Salmonella serovars isolated in litter were generally also isolated from aerosols and dust, with the Salmonella serovars Chester and Sofia being the dominant serovars across these interfaces. Campylobacter was detected late in the production cycle, in litter at levels of around 107 MPN g?1. Campylobacter was detected only once inside the shed and then at low levels of 2.2 MPN m?3. Thus, the public health risk from these organisms in poultry environments via the aerosol pathway is minimal.
机译：这项研究评估了禽舍内外气溶胶中两种关键病原体沙门氏菌和弯曲杆菌的水平，以及指示生物大肠杆菌。这项研究涵盖了三个家禽养殖场，为期三年，涵盖了整个锅炉生产周期（约55天）中的六项试验。在整个周期中，每周对垃圾和气溶胶进行测试。出现的一个关键点是，空气传播细菌的水平与垫料中这些细菌的水平有关。大肠杆菌证明了这一假设。垃圾中大肠杆菌的典型水平为〜108 CFU g？1，因此，在棚内外的气溶胶中，E。coli的水平在102至104 CFU m？3的范围内。外部级别始终低于内部级别。沙门氏菌仅间歇性地以较低的水平存在（103至105个最可能的数字[MPN] g？1），因此仅间歇性地以较低的水平存在于室内空气中（范围为0.65至4.4 MPN m？3），并且一次外（2.3 MPN m？3）。在垃圾中分离出的沙门氏菌血清型通常也从气溶胶和灰尘中分离出来，沙门氏菌血清型切斯特和索非亚是这些界面上的主要血清型。在生产周期的后期检测到弯曲杆菌，其产仔数约为107 MPN g？1。在大棚内只检测到一次弯曲杆菌，然后在2.2 MPN m？3的低水平检测到。因此，通过气溶胶途径在禽类环境中来自这些生物的公共健康风险最小。

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