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The grim trail of bacteria left by flies in hot weather is revealed

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The current hot spell of weather has seen increased activities by flies whether in the kitchen or across picnic food and barbecues.

It may make grim reading but every fly leaves a calling card in the form of bacterial deposits.

These deposits come not only from their legs, but also from the way that they eat - that is vomiting and then sucking up the resulting mixture.

Now scientists at the University of Surrey have mapped out just how much the pesky insects leave behind.

The research involved trapping blue bottle flies in a Petrie dish and then “growing” the resulting bacteria.

The results are a bit startling, for example, if a blue bottle has recently fed on faeces it may carry as many as six million bacteria on its feet.

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