Germany and Mexico cannot be clean (adjacent to the United States) or exterminated (adjacent to Kenya).
Canada cannot be clean (Germanyclue) or exterminated (adjacent to Kenya and Egypt).
Iraq, Poland, Italy and the United Kingdom are both adjacent to a clean country and Canada.
India cannot be clean (adjacent toCanada), therefor Spain is clean (Iraq clue).
Column our is the columnmentioned in the Poland clue.
Five countries are exterminated (Kenyaclue). Only Brazil, Peru, Thailand and Iran are not adjacent to a clean country).
There is no clean country in the first row yet, therefor Turkey is clean (Iraq clue).
Croatia cannot be clean (adjacent to Thailand). There are two clean and two infected countries left (Nigeria clue). The two clean countries are in row five (Egypt clue). Russia is infected.
If Laos is infected, so is China (Mexico clue). There are two clean countries in row five (Egypt clue). IfLaos is infected, there is only one clean country inrow five. So Laos cannot be infected. Laos is clean.
Vietnam is clean for the same reason that Laos is.