Hello, My Husband And I Were In Phoenix AZ For

Hello, My husband and I were in Phoenix AZ for the last 21 days. We both came down with the worst case of FLU/COLD combination like symptoms we have ever experienced. It's like both illness's mixed together. My sister who lives there has had it for 3 weeks. Is there something going on there that is highly contagious, because I am back in Colorado now and no one here has anything like this going on? Jill