Camp East Montana, an immigrant detention center in East El Paso, had an unannounced quarantine this month after four female detainees were exposed to varicella, also known as chickenpox. An additional 55 detainees were identified as secondary contacts, meaning they interacted with someone exposed to chickenpox, but not directly with an infected person. All chickenpox exposures occurred at an unidentified Arizona facility before the detainees w…