Person does not want (to) Virus. Person wants (to) Convenience. 
Person is related to Tourist. Tourist is related to Nice. Nice is the opposite of Gross. Gross is a type of Sum. 
Virus <--NotDesires-- Person --Desires--> Convenience 
Person <--RelatedTo--> Tourist <--RelatedTo--> Nice <--Antonym--> Gross --IsA--> Sum 