Science Quiz | On historical diseases that changed history


The bacteria shown here is Yersinia pestis, present in the foregut of a flea. Scientists recently found that just 5,500 years ago, these bacteria could be transmitted directly; today, they spread via infected fleas. Photo: Public domain

The bacteria shown here is Yersinia pestis, present in the foregut of a flea. Scientists recently found that just 5,500 years ago, these bacteria could be transmitted directly; today, they spread via infected fleas. Photo: Public domain

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