Completar a seguinte frase: O estudo de John Snow sobre a
️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ He used a map of deaths from cholera to determine that the source of the cholera was a pump on Broad Street.<unk> He used a map of deaths from cholera to determine that the source of the cholera was a pump on Broad Street. <unk> <unk> <unk> It was only when Robert Koch discovered bacteria years later that the mechanism of cholera transmission was understood.<unk> It was only when Robert Koch discovered bacteria years later that the mechanism of cholera transmission was understood.