Some experts credit the warning with keeping the outbreak of bacterial poisoning from becoming much worse.

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The event's website also has a message from PHW warning people about the outbreak and urging everyone to check they are immunised.

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As this result came with the benefit of hindsight, the researchers tried to come up with a real-time measure that could potentially provide an early warning sign of an outbreak as it began to spread.

ECONOMIST: Epidemiology: Infectious personalities | The