(NBC News) – The outbreak linked to romaine lettuce killed one person and sickened at least 88 more, including a 9-year-old boy who nearly died of kidney failure.

The Food and Drug Administration indicated in February that it had closed the investigation without publicly detailing what had happened — or which companies were responsible for growing and processing the contaminated lettuce.

According to an internal report obtained by NBC News, the FDA did not name the companies because no contaminated lettuce was left by the time investigators uncovered where the pathogen was coming from. (Read More)