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Get the full story behind the aches, pains and dangerous history of the flu.
In the Middle Ages, the bubonic plague ravages Europe in one of the most deadly pandemics in human history.
In the 14th century, a devastating plague known as the Black Death claimed an estimated 75 million lives.
In 1997 Dr.Johan Hultin excavated an indigenous village graveyard in hopes to find the cause of Spanish flu but found much more.
Dr. Maurice Hilleman was already an expert in viruses and vaccines when a strange flu broke out in Hong Kong in 1957. But only he saw the threat it could pose around the world.
