The prevalences of hMPV infections vary from country to country, and the consequences range from mild upper respiratory tract infection to severe bronchiolitis or pneumonia.

世界各国报道其感染率不径相同，感染症状可从轻微的上呼吸道病变到严重的细支气管炎和肺炎。

youdao

RSV, which generally circulates from late fall into the early spring, is out there with a myriad of other stuff floating around right now: Human metapneumovirus (hMPV), adenovirus and parainfluenza, all common respiratory viruses, and pertussis, the bacterial disease that causes whooping cough.

CNN: Baby ill? It might not be the flu