These symptoms may be referable tovirus infection rather than parasites.
这些症状也许是由病毒感染引起的，而与寄生虫无关。
《牛津词典》
2
Genetic sequencing has now determined that the poliovirus is most closely related tovirus from Uttar Pradesh, India.
基因测序现已确定，脊髓灰质炎病毒与印度北方邦出现的病毒联系最为密切。
3
In a reminder of the ease with which the virus travels, two recent cases in Saudi Arabia appear to be related tovirus originating in Nigeria and entering via Sudan.