The damage has become more severe in recent days as infections spread. Shares of Corona-maker Constellation Brands dived 8 per cent this week in New York.
Corona's buzz score - which tracks whether American adults aware of the brand have heard positive or negative things about it - has tumbled to 51 from a high of 75 at the beginning of the year, YouGov said.
Corona, which derives its name from the Sun's corona and has nothing to do with the virus, is the third-most popular beer in the US. Guinness is first and Heineken is second.
Another reason for the drop in purchase intent could be the perception of Corona as a summer beverage associated with beach holidays, YouGov business data journalist Graeme Bruce said this week. It therefore has substantial seasonal fluctuations, he said.