Thank you. We live up in south lake Tahoe , CA. And there is a nasty sinus infection going around. Starts with slight sore throat, then sinus issues, then into the chest. Worse part is violent coughing spells, especially at night. We're all getting it. It took me out for five weeks. And it's still not over. Everyone still has an expectorating cough. What is this virus and what are the flu symptoms.