It's all part of the fight against a new virus which causes Asian Bird Flu.
Scientists in Atlanta have recreated the virus to find out how it turned into such a deadly bug.
They hope to stop Bird Flu in its tracks before a pandemic can begin.
Researchers say they won't let the old virus leave their Atlanta labs. But, they also say Spanish Flu can now be treated successfully with anti-viral drugs, and some people may be immune to this flu strain.
Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or firstname.lastname@example.org.