Nationally, there have been more than 600 measles cases in 21 states. In the most recent Texas child death on April 3, authorities say the 8-year-old girl suffered measles pulmonary failure.

It has now spread across 23 counties in Texas, plus the states of New Mexico and Oklahoma ... particularly in unvaccinated children and pregnant women. Most children, including unvaccinated ...

So far, only two states — Texas and Kansas — are listed by the CDC as having issued "updated outbreak recommendations" in response to the virus, which are broken down by age for most residents.

Measles cases exploded in the southwest this week, with more than 483 cases confirmed in 21 states ... to spread across the US. Most of the cases remain in Texas, with authorities confirming ...