[DoughtyOne]

The dirty little secret is that feces is the problem here.

The crops could have been watered with feces contaminated water.

Years ago, that’s what caused folks to get sick from eating strawberries imported from Mexico. It was found that the plants had been watered with feces laden water.

People can nose around here for some feces/e coli contamination connections.

https://www.google.com/search?hl=en&as_q=ecoli+feces&as_epq=&as_oq=&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=&as_occt=any&safe=images&as_filetype=&as_rights=

[gleeaikin]

It seems to be more of a northern problem. Canada has a significant number of cases. There are articles that list how many cases are in different states. If I remember correctly, lettuce types tend to prefer cooler weather than Mexico.