The first drug to treat smallpox has been approved by the U.S. Food and Drug Administration.
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A massive vaccination campaign led to the eradication of smallpox worldwide by 1980, but there are fears the highly contagious virus could be used in a terror attack.
The U.S. government has already stockpiled 2 million treatments of the new capsule drug, which is called TOPXX and is made by SIGA Technologies of New York, the Associated Press reported.
"This new treatment affords us an additional option should smallpox ever be used as a bioweapon," FDA Director Dr. Scott Gottlieb said in a statement.
TOPXX is taken twice daily for 14 days, the AP reported.
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