The phrase "a virus and a" is correct and usable in written English.
It can be used when listing items or discussing multiple subjects, particularly in a scientific or medical context.
Example: "The study focused on a virus and a bacteria that were both responsible for the outbreak."
Alternatives: "a virus and another" or "a virus along with a".
Scientists have long theorized that lupus somehow results from an interaction between a virus and a genetic susceptibility to lupus.
The article described two new suspect factors — a virus and a fungus, acting in combination: "together, the research suggests, they are 100 percent fatal".
But Kvitova was weakened by a virus and a fever the day before the match, and she received medical attention before the final game of the second set.
For one song, Virus, the app will feature a close-up study of cells being attacked by a virus to represent what Snibbe calls: "A kind of a love story between a virus and a cell.
The SoBig program, which has attributes of both a virus and a worm, is a striking contrast to the Blaster worm, which was used this month to try to exploit a vulnerability in Microsoft's Windows operating system.
He said that "after eight years of Israel being called a virus and a cancer, and Holocaust denial, Israelis are very sensitive about anything that is said about their country".
Current influenza virus vaccines consist of 3 components: an H1N1 (hemagglutinin [HA] subtype 1; neuraminidase [NA] subtype 1), an H3N2 influenza A virus, and an influenza B virus.
Viruses of both B lineages now co-circulate together with the Influenza A viruses A(H3N2) and A(H1N1) [ 6].
It was at this time I came down with a virus and spent a few days in bed.
Ms. Silverstein was a healthy 24-year-old law student when she suddenly developed heart failure from a virus and required an emergency heart transplant.
A few days later, Jonny contracted a virus and was out of action for a month.
