Two Alabama counties have lead poisoning among the worst in the country and much higher than Flint, Michigan, including one where a majority of children tested had lead poisoning.

According to CDC data compiled by Vox.com, Houston County has the highest reported level of lead poisoning in the country, with seven of 12 children tested there having lead levels high enough to qualify as lead poisoning.

That's in contrast to Flint, where about 4 percent of children have tested positive for lead poisoning.

Meanwhile, in Dallas County, more than one in three children tested positive for lead poisoning.

The CDC defines lead poisoning as having 5 micrograms or more of lead per deciliter of blood, although no level of lead is considered safe or harmless.

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