This does not imbue one with the highest of confidence:
The pan-seared breast of Chicken Marsala served by the Baltimore Convention Center’s exclusive caterer was the food item most commonly consumed by the 216 attendees sickened by the lunch served last April 9 at the Food Safety Summit’s annual conference. It was likely contaminated with Clostridium perfringens (C. perfringens), a spore-forming gram-positive bacterium commonly found on raw meat and poultry.
Local health department officials only learned about the contamination because:
On April 11, 2014, the Baltimore City 311 system received 3 reports of illness from attendees of Conference A. A 4th report was received on April 15. All of the reports were from conference attendees who also worked in the same building at another work location. The reporters stated that they, and several coworkers who also attended Conference A, became ill with diarrhea between April 8 and April 10. The attendees suspected that lunch served on April 9 was the source of the illnesses.
Maybe ironic, maybe bad luck; but definitely disheartening.