My oldest had his first test at 18 months and then had three additional negative tests (yearly) before testing positive at 5 1/2. My daughter tested negative three times before testing positive last week at 4 1/2. My two littlest have so far tested negative three times, so I guess we are just waiting to see now!
Did/does anyone else test yearly? My oldest had unusual symptoms, so we didn't figure out what was going on quickly. My daughter, though, had the same symptoms her big brother had, so we just knew and expected her test to be positive. So far, the younger two have no symptoms, but we keep wondering and waiting.