sentences:  The NBTCC has unique national biosafety level 3 and 4 aerobiology capabilities, which are necessary to collect crucial data that is used to develop biodefense plans and responses.In 2013, it provided necessary data, which addressed 10 specific biological agent knowledge gaps, to improve hazard, risk, and threat assessments.The data allowed for significant growth in the credibility of hazard and risk assessment modeling of bioterrorism scenarios for a variety of toxin threat agents, including both bacteria and viruses.