And racings checkered past. Ever aspect of life. Nightline starts right know. Byron pitts. Good evening. Thank you for joining us. Tonight parts of the u. S. Seeing what a Top Health Official says is a disturbing surge in covid19 infections. Now the Health Care Heroes going wherever the virus takes them. Their latest battle ground, arizona. Heres matt gutman. Today is my first day on the floor on my own. Its exciting, but its a little bit scary. Reporter Bridget Harrigan has answered the call of about, hospitals overwhelmed with covid19 cases are desperate for help from people like her. Be putting me in the covid unit the whole time. So ill want to be dressed up for that before i even get in the building. I was meant to go help on the front lines in some way. Reporter the traveling nurse has seen what the coronavirus has done to a dedated herself t fighting this pandemic starting in new york city. My hospital was full of patients, pull of people. Ive been to hospitals before where the