Final answer:
A foodborne illness is considered an outbreak when two or more people experience the same disease after consuming food from a common source.
Step-by-step explanation:
An outbreak of a foodborne illness occurs when two or more people experience the same disease after consuming food from a common source. It is considered an outbreak when there is a significant increase in the number of cases compared to what is expected. For example, if a restaurant serves contaminated food that results in multiple customers getting sick, it would be considered an outbreak.
One example of a foodborne illness outbreak in the United States is the Salmonella outbreak that occurred due to contaminated onions produced in California. Over 1,100 people across 48 states were infected with the outbreak strain of Salmonella Newport. This outbreak was considered an outbreak because it involved a large number of cases linked to a common source of contamination.
Foodborne illness outbreaks can occur in various settings such as restaurants, nursing homes, hospitals, schools, and summer camps. It is important to identify and respond to outbreaks quickly to prevent further infections and protect public health.