A viral disease or infection is caused by a virus.
例句
...a 65-year-old patient suffering from severe viral pneumonia.感染了严重病毒性肺炎的65岁病人
英汉词典释义
adj.
病毒的,病毒引起的
the immune response to viral infections对病毒感染的免疫力a rare viral infection that can lead to heart failure可引起心力衰竭的罕见病毒感染He is suffering from viral meningitis.他患病毒性脑膜炎。