Which of the following is not a causative agent for food poisoning?

Food poisoning is a condition that results from consuming contaminated food or drinks. The Centre for Disease Control has given the top five germs that cause food poisoning. They are Norovirus, Salmonella, Clostridium, Campylobacter, and Staphylococcus. 

The flu virus is also known as the influenza virus. It causes a highly contagious respiratory illness that affects millions of people worldwide each year. The symptoms of flu include fever, cough, sore throat, runny or stuffy nose, body aches, headache, chills, and fatigue.