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Historically, bacteria have been responsible for some of the deadliest epidemics, including Plague of Justinian and the Black Death. So why are more recent pandemics caused by viruses, rather than bacteria?

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Historically, bacteria have been responsible for some of the deadliest epidemics, including Plague of Justinian and the Black Death. So why are more recent pandemics caused by viruses, rather than bacteria?	1