Ohio and Texas have issued warnings about a toxic substance found in at-home COVID-19 test kits that can be life-threatening upon exposure.

Cincinnati Children's Hospital Medical Center released a statement on Facebook last week warning of sodium azide poisoning, a chemical found in the test kits.

"We started getting our first exposures to these test kits around early November," said Sheila Goertemoeller, pharmacist and clinical toxicologist for the center. "It was, really, all ages."