"The extinct influenza virus that caused the worst flu pandemic in history has been recreated from fragments of avian flu found in wild ducks in a controversial experiment to show how easy it would be for the deadly flu strain to reemerge today. Scientists said the study involved infecting laboratory ferrets with close copies of the 1918 virus – which was responsible for the Spanish Flu pandemic that killed an estimated 50 million people – to see how easy it can be transmitted in the best animal model of the human disease."
http://www.independent.co.uk/news/science/american-scientists-controversially-recreate-deadly-spanish-flu-virus-9529707.html
Do not fear science.