Which of the following is NOT a reason an employee cannot work?

An employee's fatigue is typically not considered a valid reason for being unable to work compared to the other listed health concerns. While fatigue can certainly affect a person's performance and well-being, it does not pose a direct risk to food safety or the health of coworkers and customers as the other conditions do. Vomiting and fever with a sore throat are symptoms that can indicate contagious illnesses, which pose health risks in a food service environment. Similarly, open wounds that are not properly covered can lead to contamination. Therefore, fatigue may require an employee to seek rest or recovery, but it does not warrant the same immediate concern regarding overall safety and hygiene that the other options represent.