5Schierl R, Heise A, Egger U, et al. Endotoxin concentrations in modem animal houses in southern Bavaria[J]. AnnAgric Environ Med, 2007, 14: 129-136.
6Donham K J, Haglind P, Peterson Y, et al. Environmental and health studies of farm workers in Swedish swine confinement buildings[J]. Brit J Ind Med, 1989, 46: 31-37.
8Berger I, Schierl R, Ochmann U, et al. Concentrations of dust, allergens and endotoxin in stables, living rooms and mattresses from cattle farmers in southern Bavaria[J]. Ann Agric Envi-ronMed, 2005, 12: 101-107.
9Dutkiewicz J, Pomorski Z J H, Sitkowska J, et al. Airborne microorgan- isms and endotoxin in animal houses[J]. Grana, 1994, 33: 85-90.
10Chang C W, Chung H, Huang CF, et al. Exposure assessment to airborne endotoxin, dust, ammonia, hydrogen sulfide and carbon dioxide in open style swine houses[J]. Ann OccupHyg, 2001, 45: 457-465.
