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 型副流导致的染，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，新冠疫苗制造商 Moderna 成了一种针对HMPV和副流的 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.

这些致与导致普通冒的相同，如鼻、冠状、流、呼吸道合胞（简称RSV）以及副流。