Vaccination

"A measles outbreak in Orange County in California, affecting 21 people is the most recent example of the return of the highly contagious viral illness.
“There have been 49 cases confirmed in the state so far this year,” Dr. Nancy Snyderman, NBC News’ chief medical editor told TODAY’s Natalie Morales. “Eight big pockets are accounting for 77 percent of cases in this country and there are two reasons: under-vaccinated children or unvaccinated children.”
More than 20 cases of measles in California due to 'unvaccinated children' - TODAY.com

The question:

If your child contacts a disease from a purposefully unvaccinated child....can you sue the offending parents?

Aufgeblassen said:

But can you even prove which exact other child your kid got it from??? Does not seem like it.

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Perhaps...as the records of immunization are on file.

Aufgeblassen said:

That would only work if only one kid in the whole school did not get immunized. But if there is more than one...? :unsure:

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One might also look to see which kid has measles?