Which of the following is not a symptom that prohibits a foodhandler from working?

A headache is not typically considered a symptom that prohibits a food handler from working because it is usually not directly associated with foodborne illness or contamination risks. In contrast, fever, coughing, and nausea are symptoms closely related to potential contagious diseases or conditions that could pose a health risk to consumers.

Fever might indicate an infectious disease, which could be transmitted through food if a food handler were to work while experiencing it. Coughing can also be a symptom of respiratory illnesses, with the potential to spread pathogens through respiratory droplets. Nausea points to gastrointestinal issues that could indicate illness and contaminate food if a food handler is not feeling well. Therefore, the presence of fever, coughing, or nausea would warrant a food handler's exclusion from work to ensure food safety and protect public health, while a headache does not typically carry the same immediate concern.