Atossa Genetics, Inc. (NASDAQ: ATOS) (“Atossa” or the “Company”) received a Warning Letter (“Letter”) from the FDA on February 21, 2013, regarding its Mammary Aspirate Specimen Cytology Test (MASCT) System and MASCT System Collection Test (together, the “System”). The Letter arises from certain FDA findings during a July 2012 inspection, to which the Company responded in August 2012, explaining why the Company believed it was in compliance with applicable regulations and/or was implementing changes responsive to the findings of the FDA inspection. The FDA alleges in the Letter that following 510(k) clearance the Company changed the System in a manner that requires submission of an additional 510(k) notification to the FDA. Specifically, the FDA observes that the Instructions For Use (IFU) in the original 510(k) submission stated that the user must “Wash the collection membrane with fixative solution into the collection vial…” and the current IFU states “…apply one spray of Saccomanno’s Fixative to the collection membrane…” and that “this change fixes the NAF specimen to the filter paper rather than washing it into a collection vial.” At the time that the changes were made the Company determined that a new 510(k) was not required in accordance with the FDA’s guidance document entitled “Deciding When to Submit a 510(k) for a Change to an Existing Device.” The Letter also raises certain issues with respect to the Company’s marketing of the System and the Company’s compliance with FDA Good Manufacturing Practices (cGMP) regulations, among other matters. The Company is committed to working with the FDA to resolve these issues in the best interests of patients and their doctors. If the FDA does not agree with the Company’s position concerning clearance of the System, Atossa may be required to submit and receive clearance of a new 510(k) notice for the current form of the System or revert to marketing the System using the prior NAF processing method.