Detection of Mycoplasma bovirhinis and bovine coronavirus in an outbreak of bovine respiratory disease in nursing beef calves

作者：Tara G. McDaneld, Aspen M. Workman, Carol G. Chitko-McKown, L. A. Kuehn, Aaron M. Dickey, Gary L. Bennett · 发表于：Frontiers in Microbiomes · 年份：2022 · DOI：10.3389/frmbi.2022.1051241 · 被引用次数：12 · 研究领域：Microbial infections and disease research、Animal health and immunology、Animal Virus Infections Studies

Introduction: Respiratory disease incidence is intimately associated with an animal's commensal bacteria populations (microbiome), as microbes that are involved with morbidity and mortality are commonly found in animals with no sign of disease. In addition, viral pathogens affect the immune system and appear to play an integral role in the overall incidence of bovine respiratory disease (BRD); so, an understanding of the interaction of the bacterial and viral pathogens in the upper respiratory tract (URT) may help us to understand the impact of these pathogens on development of BRD. For this research, the overall goal was to characterize bacterial and viral populations in the URT of nursing beef calves at initial vaccination and at the time of a BRD outbreak. Methods: Nasal swabs from the URT were collected at initial vaccination (average 45 days of age) and again at the time of the BRD outbreak (average 126 days of age). DNA and RNA were extracted from nasal swabs to evaluate bacterial and viral populations in the URT. Whole blood was also collected at the time of the BRD outbreak for determination of complete blood counts. To evaluate the microbiome, hypervariable regions 1 through 3 along the 16S ribosomal RNA (rRNA) gene were amplified by PCR and sequenced using next-generation sequencing (Illumina MiSeq) for identification of the bacterial taxa present. To evaluate the viral pathogens, multiplex reverse transcription real-time polymerase chain reaction and next-generatio...