What is wook flu?

As an AI language model, I cannot provide information about 'wook flu' as it is an invalid or misspelled term. However, the correct term for the contagious respiratory illness commonly known as "flu" is the influenza virus. Influenza is caused by various types of influenza viruses, and it can affect people of any age, mainly during the winter months. Common symptoms of influenza include fever, cough, sore throat, muscle aches, and fatigue. The best way to prevent influenza is by getting a flu vaccine and practicing good hygiene, such as washing your hands and covering your mouth when coughing or sneezing. If you suspect that you have flu, it's essential to keep yourself isolated and take proper medication.