Final answer:
The food handler vomiting from an infectious condition should be excluded from work to prevent foodborne illness transmission. Practices like good hand hygiene and proper food temperatures are critical in preventing such illnesses. The illness, possibly norovirus, could have spread due to poor hygienic practices.
Step-by-step explanation:
When a food handler is vomiting due to an infectious condition, they should be excluded from work to prevent the spread of illness. In the case study presented, the hospital saw an additional 19 cases of rapid-onset gastroenteritis linked to a restaurant, which may have been caused by an infected person with poor hygiene practices handling food. Norovirus is a common cause of foodborne illness, with very few virus particles needed to make others sick. Foodborne illnesses like these can stem from foods such as leafy greens, fresh fruits, shellfish, or from coming into contact with contaminated surfaces.