Person does not want (to) Virus. Person does not want (to) Flood. Flood is a synonym of Drown. Rat does not want (to) Drown. 
Drop is a type of Decline. 
Virus <--NotDesires-- Person --NotDesires--> Flood <--Synonym--> Drown <--NotDesires-- Rat 
Decline <--IsA-- Drop 