This BUG will be hard to recreate because it only seems to effect a small portion of players. Me and my friend have been playing for some time now and know about what sickness there are and how to cure each type by its symptoms as well as how to avoid getting sick in the first place. That said, we have had multiply play sessions where he is always sick. First with a Cold then he gets Cholera, we then spend our entire 8 hour play session going from hospital to hospital where he can take upwards of six tetracycline in a ROW and still no cure. It completely ruins the game for us because he is constantly puking and has a hard drain on his meters because of the cold he has which also wont be cured, even by sitting in a warm place and him sipping liquids and foods for HOURS.
For comparison I only got sick once, when i caught the cold from him, if that is possible. I cured it with two tetracycline pills while he had taken upwards of four in a row at this point with no cure.
WE PLAY ON OFFICIAL SERVERS
WE DO NOT DRINK STRANGE WATER
WE WASH OUR HANDS
WE EAT ONLY GOOD FOOD
WE STAY WARM OFTEN
He only does what I do so if the sickness is working correctly we both should have been sick but it only happens to him, this has happened more than once on more the one official server.