From the article:
The FDA had been gradually clearing tomato-growing regions in the United States and Mexico since it issued the warning June 7. As the weeks passed, however, growers argued the warning was becoming moot because it was no longer possible for areas that were harvesting in April to still be producing tomatoes.
Criticism of the tomato warning intensified as people continued to get sick. Investigators began looking at other potential suspects and turned their attention to cilantro and jalapeño and serrano peppers.