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oai:recercat.cat:20.500.12327/6712025-10-22T11:05:02Zcom_2072_4428com_2072_4427col_2072_487898

00925njm 22002777a 4500 dc Zhang, Peng author Zhang, Chaoyang author Aragon, Virginia author Zhou, Xue author Zou, Ming author Wu, Congming author Shen, Zhangqi author 2019-02-25 Haemophilus parasuis is a common colonizer of the upper respiratory tract of swine and frequently causes disease, especially in weaner pigs. To date, limited epidemiological data was available for H. parasuis from healthy pigs, which might be carriers of potential pathogenic strains. In this study, from September 2016 to October 2017, we investigated the prevalence and characteristics of H. parasuis from healthy pigs in China. Totally, we obtained 244 isolates from 1675 nasal samples from 6 provinces. H. parasuis isolation was more successful in weaner pigs (22.6%, 192/849), followed by finisher pigs (9.3%, 43/463), and sows (2.5%, 9/363). The most prevalent serovars were 7 (20.1%, 49/244), followed by 3 (14.8%, 36/244), 2 (14.3%, 35/244), 11 (12.7%, 31/244), 5/12 (5.7%, 14/244) and 4 (2.5%, 6/244). Bimodal or multimodal distributions of MICs were observed for most of the tested drugs, which suggested the presence of non-wild type populations. It was noted that the MIC90 values of tilmicosin (64 μg/ml) was relatively higher than that reported in previous studies. Our results suggest that: 1) potentially pathogenic serovars of H. parasuis are identified in healthy pigs, and 2) elevated MICs and presence of mechanisms of resistance not yet described for clinically important antimicrobial agents would increase the burden of disease caused by H. parasuis. Zhang, Peng, Chaoyang Zhang, Virginia Aragon, Xue Zhou, Ming Zou, Congming Wu, and Zhangqi Shen. 2019. "Investigation Of Haemophilus Parasuis From Healthy Pigs In China". Veterinary Microbiology 231: 40-44. Elsevier BV. doi:10.1016/j.vetmic.2019.02.034. 0378-1135 http://hdl.handle.net/20.500.12327/671 https://doi.org/10.1016/j.vetmic.2019.02.034 Investigation of Haemophilus parasuis from healthy pigs in China