NEW YORK--(BUSINESS WIRE)--SIGA Technologies, Inc. (NASDAQ: SIGA), a company specializing in the development of pharmaceutical agents to fight biowarfare pathogens, announced today that it has submitted to the FDA an application to support an Emergency Use Authorization (EUA) of its drug ST-246, an orally active, smallpox antiviral, to treat individuals exposed to the smallpox virus in the event of an outbreak.