I have added this page to my site primarily because my children were misdiagnosed (for two months - with each call to the advice nurse resulting in the comment “your child does not have a fever, I am sure they are okay. Call us back if they develop a fever.”) and I have heard so many others with a similar story.

Time makes a big difference and early diagnosis can make it so a child lessens their exposure risk (because hazards are then identified and cleaned up sooner.) Early diagnosis with one child will also prevent future exposure of other children from the same source.
The only way to know for sure if your child, your home or your soil is contaminated is to test.
Tamara Rubin