My 3 year old has the same thing, high fever and white spots on his throat. This is the 3rd episode I have tracked in the past 3 months (every 3 weeks). Strep Tests have all been negative. He also is being treated for Allergic Rhinitis. I am just wondering what conclusion you came to - if any. He has an appt tomorrow with his Dr. and I am going to request ant ENT appt and blood work. Any help you may have for me would be appreciated. THanks!