Mostly, it is viral infection parainfluenza type I and II, affecting children between 6 months to 3 years of age.

大多数是 I 型和 II 型副流导致的病，多见于 6 个月到 3 岁的儿童。

Covid-19 vaccine maker Moderna just finished an early study of an mRNA vaccine against HMPV and parainfluenza, according to the website clinicaltrials.gov.

据 clinicaltrials.gov 网站报道，新冠病疫苗制造 Moderna 完成了一种针对HMPV和副流病的 mRNA 疫苗的早期研究。

These viruses are the same ones that cause the common cold like rhinovirus, coronavirus, influenza virus, respiratory syncytial virus- or RSV for short, and parainfluenza virus.

这些致病病与导致普通冒的病相同，如鼻病、冠状病、流病、呼吸道合胞病（简称RSV）以及副流病。