An ongoing measles outbreak that began in one of Texas’ least vaccinated counties has mushroomed to 90 cases across a cluster of seven counties in the state, according to an update by the Texas Department of State Health Services on Friday.
The outbreak may have also spread across the border to New Mexico, where nine cases have been reported. In an email to Ars, Robert Nott, the communications director for the New Mexico Department of Health, said that as of today, the department has not confirmed a connection between the nine cases and any of the confirmed cases in Texas.
However, all nine of the cases are in Lea County, New Mexico, which sits at the border with Gaines County, Texas, the epicenter of the outbreak. Of Texas’ 90 cases, 57 are in Gaines, which has a vaccination rate among kindergarteners of just 82 percent this school year. The lack of a clear connection between the Texas and New Mexico cases may be yet more worrying because it suggests undetected community spread and a heightened risk of transmission in Lea, the health department noted in an alert last week.
Other affected counties in Texas include Dawson (6 cases); Ector (1); Lubbock (1); Lynn (1); Terry (20); and Yoakum (4).
In Texas, the majority of the cases continue to be in children: 26 are in infants and young children ages 0 to 4, and 51 are between ages 5 and 17. All but five cases have been in unvaccinated people. Sixteen people (roughly 18 percent) have been hospitalized.
In New Mexico, there have been no hospitalizations, and five of the nine cases are in adults. The other four cases were between the ages of 5 and 17.
Given low vaccination rate in the area and the contagiousness of measles, health officials expect the outbreak to continue to grow. Measles is one of the most infectious viruses known; 90 percent of people who are unvaccinated and exposed will fall ill. The disease is marked by high fevers and a telltale rash and can cause severe complications in some, including younger children.
In the US, about 20 percent of people with measles are typically hospitalized. Five percent develop pneumonia, and up to 3 in 1,000 die of the infection. In rare cases, measles can cause a fatal disease of the central nervous system later in life called Subacute sclerosing panencephalitis. Measles also wipes out immune responses to other infections (a phenomenon known as immune amnesia), making people vulnerable to various illnesses.