According to the article, how can a person be a source of food-born illness?

It has batería and it's like a host and will stop the bacteria from spreading

Foodborne illness is caused by consuming contaminated foods or beverages.

Many different disease-causing microbes or pathogens can contaminate foods, so there are many different types of foodborne illnesses.

Most foodborne diseases are infections caused by a variety of bacteria, viruses, and parasites.