Products have been removed from store shelves, but health officials are concerned they may still be in consumers' refrigerators.
Twenty-four cases in 14 states have been identified, with 5 hospitalizations.
The positive product sample in Minnesota was connected to an illness investigation.
So far in this outbreak, 40 sick people resided in long-term care facilities, and 30 children attended childcare centers before they got sick.
Cases have been reported in 23 states, including 1 death in Wisconsin.
The new outbreak-related death was in Oregon; the previous two were in Minnesota.
The outbreak, linked to precut cantaloupe, has now topped 100 illnesses in 34 states.
The US outbreak has more than doubled in just a week, has hospitalized at least 45, and has killed 2 Minnesotans.
So far at least 11 people in seven states have been sickened with Listeria monocytogenes, which can cause severe and fatal infections.
Most of the patients are babies who likely got sick after touching dog food or were exposed to dogs and their environments.
