Microorganisms can grow in colder temperatures. pathogenic viral spoilage parasitic

Spoilage is the answer they can grow in cold temperatures and very hot.

It doesn't state that he washed his hands before or after preparing this poultry. even though he had it in seperate bags the bacteria from the poultry could have entered the vegtables because of a lack of handwashing. so cross-contamination is a very possible answer.