6 ms·

any reason why a foodborne illness would have two "waves" like this? Different batches?

• dlcarrier 1mo ago
  There's two things going on here. Most people don't report their illnesses, especially minor ones. The people that did report their illness trigger an investigation that then hunts down the people that didn't initially report their illnesses, so a month or two after the initial outbreak, you get numbers that are revised higher. Regarding the two humps in the illness dates, that's because there's two events involved, over two different supply chains. Restaurant supply chains are faster than retail supply chains, and retail customers don't immediately consume the food they purchase, so the peak illness date from the retail supply chain is much later than the peak illness date from the restaurant supply chain.