Red Green Blue are the three primary colors by light jackoff. Yellow is only a primary color as a pigment, but if you're using pigments red and blue aren't primary either, it's yellow, cyan, and magenta. You fail.
A quick note, this really works. I started in Canada, and following this, I had every country infected and every symptom I needed for the rest of the game by day 18. 1, Pick Virus 2, Start in Canada, Greenland, New Zealand, Cuba (if not, restart) 3, Sell starting symptoms (if any), other than sneezing. If you don’t have sneezing, buy it 4, Buy 1-1-1-0 Resistances 5, Once your disease spreads to a few countries, sell sneezing to get rid of visibility 6, Wait until all countries are infected. If Madagascar closes or this is after day 30, restart 7, Pump 4 Drug Resistance and buy sneezing, coughing, vomiting 8 After a few days, unlock tier 2-3 keeping whatever symptoms it gives you 9 Buy fever, fatigue, diarrhea, pulmonary edema, hypersensitivity, hemorrhaging 10 Wait until everyone dies IT WORKS!!!!!! COPY AND PASTE IF IT WORKS FOR YOU CREATED BY: Chuck Norris ALL WORK WAS DONE BY HIM!!!