Inside a Houston primary care doctor's quest to find vaccines for her patients

It’s cold in one corner of Dr. Lisa Ehrlich’s office. Minus 80 degrees Celsius, to be precise. That’s the work of Bill, a 150-lb, boxy, beige ultra-cold freezer that Ehrlich, a primary care physician in River Oaks, tracked down at a medical research lab in San Antonio. She spent nearly $30,000, including purchase price, to get it up and running — and keep it running.