In response to the ongoing measles outbreak in Texas, the Mexican government has issued a travel advisory cautioning its citizens against traveling to the Lone Star State.

The World Health Organization has warned that its largest global laboratory network is on the brink of collapse unless new funding is secured to replace the support lost after President Donald Trump’s order to withdraw from the United Nations agency.

The interim guidance document was shared with staff Thursday in the CDC’s National Center for Immunization and Respiratory Diseases, or NCIRD, and specifically its Influenza Division — but it was worded broadly, referring to CDC staff in general in its body text. It’s not clear how many other CDC divisions received the memo.

For a community to be protected against contagious diseases, enough residents need to be vaccinated to provide “herd immunity.”

Amid the spreading surge in Texas and nearby states ... affects children. According to the World Health Organization (WHO), it infects the respiratory tract before spreading throughout the body. The virus is highly contagious; so contagious, in fact ...