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 型副流感导致的病毒感染，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.

clinicaltrials.gov 报道，新冠病毒疫苗制造商 Moderna 刚刚完成了一种针对HMPV和副流感病毒的 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.

这些致病病毒与导致普通感冒的病毒相同，如鼻病毒、冠状病毒、流感病毒、呼吸道合胞病毒（简称RSV）以及副流感病毒。