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While rotavirus is primarily known to cause gastroenteritis in many animals, several epidemiological studies have shown concurrent respiratory symptoms with fecal and nasal virus shedding. However, respiratory rotavirus infections have rarely been investigated.
By screening clinical samples submitted for diagnostic testing, porcine rotavirus A (RVA) was detected by quantitative reverse transcription PCR (qRT-PCR) in 28 out of 91 (30.8%) lungs obtained from conventionally reared pigs with respiratory signs. Among the positive cases, intensive RVA signals were mainly localized in alveolar macrophages and bronchiolar epithelial cells by in situ hybridization. The signals of RVA in bronchiolar epithelial cells were verified by in situ hybridization with different probes, immunohistochemistry, and transmission electron microscopy. Furthermore, additional cases with RVA in situ hybridization-positive signals in alveolar macrophages and bronchial epithelial cells were identified by screening 120 archived formalin-fixed and paraffin-embedded lung samples using tissue microarrays.
Overall, our study showed a high frequency of RVA detection in lungs from conventional pigs with respiratory disease. Further research is needed to determine if RVA infection in the respiratory epithelium correlates with nasal shedding of rotavirus and its contribution to respiratory disease.
Nelsen A, Lager KM, Stasko J, Nelson E, Lin C-M, Hause BM. Identification of Pulmonary Infections With Porcine Rotavirus A in Pigs With Respiratory Disease. Frontiers in Veterinary Science. 2022; 9: 918736. doi: 10.3389/fvets.2022.918736