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Covenant Children's Hospital in nearby Lubbock told the BBC it has treated several unvaccinated children with measles for vitamin A toxicity - some had used it a preventative measure.

"Our company unequivocally condemns all forms of violence and tensions that fuel a climate of toxicity that undermines all progress."

"Although we lack high-quality data determining the exact amount of takes to be lethal, just one kernel seems to be enough to cause significant toxicity and even death."

In Lubbock, Covenant's Children's Hospital has treated several children for Vitamin A toxicity after they were sent to the hospital for measles complications.

She said the "toxicity" of Prince Harry's brand was the "number one risk for this organisation".