West Europe is actually pretty easy to infect every time if you play your cards right.
1. Wait it out a few days or weeks, then start buying transmissions and selling symptoms
2. Make sure you buy "body fluids" under Transmissions before you sell all your symptoms. This way you will have 0 lethality, 0 visibility but 1 infectivity.
3. Keep riding it out and check infecteds in all regions while also keeping track of points
4. As your points go up, fill the transmissions, it should quickly infect everyone (And that includes West Europe)
5. KILL KILL KILL KILL KILL MUAHAHAHAHAAHAH. Once you get lethal, you may see some 200,000+ dead in a day
I tried this 3 times, was successful every time. Oh man, imagine being literally one of the last two or three people alive on Earth...