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When you leave the game running unattended and anyone gets sick, only a checked doctor will go to them without you physically taking someone to heal them. Also, sometines you don't realise someone IS sick, especially if you have a high population, but a doctor will "hear" the sick person even if you don't



I have seen an unchecked doctor go to a sick person, just not as quickly as a checked one. Except in one case, where a youngster loved running and was not even a trainee doctor yet, came running up ahead of the checked adept doctor to heal the person.