One of the earliest triumphs of public health was to reduce the mortality caused by gastrointestinal infections in many parts of the world. Cholera and typhoid have become rare diseases in developed countries, but one of the failures of public health has been that large numbers of people in poorer communities do not have clean drinking water and uncontaminated food. This mixture of success and failure, of triumph and disaster, is a reason why any signs of the re-emergence of cholera and the increase in salmonellosis in the last 20 years caused confusion and panic.
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