ʻO ka maʻi hanu syncytial kahi maʻi RNA no ka genus Pneumovirus, ʻohana Pneumovirinae.Hoʻolaha nui ʻia e ka hoʻoili ʻia ʻana o ka droplet, a ʻo ka hoʻopili pololei ʻana i ka manamana lima i haumia ʻia e ka maʻi respiratory syncytial me ka nasal mucosa a me ka ocular mucous kahi ala nui o ka lawe ʻana.ʻO ka maʻi hanu syncytial ke kumu o ka pneumonia.I ka wā incubation, ʻo ka respiratory syncytial virus ka mea e hoʻoulu ai i ke kuni, ka ihu e holo ana, ka ʻū, a i kekahi manawa hoʻi.Hiki ke loaʻa ka maʻi maʻi respiratory syncytial ma waena o nā heluna kanaka o kēlā me kēia makahiki, kahi e loaʻa ai ka maʻi o ka poʻe ʻelemakule a me nā poʻe me nā māmā ʻeha, ka puʻuwai a i ʻole ka ʻōnaehana pale.