I am a female, age 65, and I have been experiencing spikes in fevers around 101, with chills, that last 24 to 48 hours, occurring about 2 to 3 weeks apart. The first time was after caring for my twin grandchildren, who came down with the same type of fever and chills of short duration about 2 months ago. One child, age 1 1/2, also had a relapse once about 1 to 2 weeks later, but the other is fine. What could this be? YYYY@YYYY