Terentjeva Margarita, Šteingolde Žanete, Meistere Irēna, Elferts Didzis, Avsejenko Jeļena, Streikiša Madara, Gradovska Silva, Alksne Laura, Ķibilds Juris, Bērziņš Aivars
Institute of Food and Environmental Hygiene, Faculty of Veterinary Medicine, Latvia University of Life Sciences and Technologies, LV-3004 Jelgava, Latvia.
Institute of Food Safety, Animal Health and Environment "BIOR", LV-1076 Rīga, Latvia.
Pathogens. 2021 Jul 6;10(7):851. doi: 10.3390/pathogens10070851.
spp. is a diverse genus of Gram-positive bacteria commonly present in the environment while and are well known human and ruminant pathogens. The aim of the present study was to reveal the prevalence and genetic diversity of and other spp. and to identify the factors related to the abundance of pathogen at cattle farms. A total of 521 animal and environmental samples from 27 meat and dairy cattle farms were investigated and the genetic diversity of isolates was studied with WGS. The prevalence of was 58.9%, while of it was -11%. The highest prevalence of was found in the environment-soil samples near to manure storage (93%), mixed feed from the feeding trough and hay (29%), water samples from farms drinking trough (28%) and cattle feces (28%). Clonal complexes (CC) of CC37 (30%), CC11 (20%) and CC18 (17%) (all IIa serogroup) were predominant clones. CC18, CC37 and CC8 were isolated from case farms and CC37, CC11 and CC18 from farms without listeriosis history. Only one hypervirulent CC4 (1%) was isolated from the case farm. Sequence types (STs) were not associated with the isolation source, except for ST7, which was significantly associated with soil ( < 0.05). The contamination of soil, feeding tables and troughs with was associated with an increased prevalence of at farms. Our study indicates the importance of hygienic practice in the prevention of the dissemination of in the cattle farm environment.
李斯特菌属是革兰氏阳性菌的一个多样化属,通常存在于环境中,而单核细胞增生李斯特菌和伊氏李斯特菌是著名的人类和反刍动物病原体。本研究的目的是揭示单核细胞增生李斯特菌和其他李斯特菌属的流行情况和遗传多样性,并确定与奶牛场病原体丰度相关的因素。对来自27个肉牛和奶牛场的521份动物和环境样本进行了调查,并采用全基因组测序研究了李斯特菌分离株的遗传多样性。单核细胞增生李斯特菌的流行率为58.9%,而伊氏李斯特菌的流行率为-11%。在靠近粪便储存处的环境土壤样本(93%)、饲槽中的混合饲料和干草(29%)、农场饮水槽中的水样(28%)和牛粪(28%)中发现单核细胞增生李斯特菌的流行率最高。CC37(30%)、CC11(20%)和CC18(17%)(均为IIa血清群)的克隆复合体是主要的克隆。CC18、CC37和CC8从病例农场分离得到,CC37、CC11和CC18从无李斯特菌病病史的农场分离得到。仅从病例农场分离出一株高毒力CC4(1%)。除ST7与土壤显著相关(P<0.05)外,序列类型与分离来源无关。土壤、饲台和饲槽被单核细胞增生李斯特菌污染与农场中该菌流行率增加有关。我们的研究表明卫生措施在预防奶牛场环境中单核细胞增生李斯特菌传播方面的重要性。