Foxy lettuceThe Monterey Herald reports that Mexico is banning U.S. imports. More countries to follow?

Mexico’s Department of Health announced Monday that the country’s 105 ports of entry would block all U.S. lettuce from coming through the border as a result of Nunes Co.’s precautionary recall.

The family-run company recalled the lettuce after water from a reservoir at one of its grower’s fields tested positive for generic E.coli, many harmless strains of which live in human intestines.

But on Tuesday, further tests of the recalled lettuce showed that the E.coli in the irrigation water was not the 0157:H7 strain, the form of the bacteria responsible for the outbreak linked to spinach that killed three people and sickened 199 others.