The rapidly escalating surge in COVID-19 infections across the U.S. has caused a shortage of nurses and other front-line staff in virus hot spots that can no longer keep up with the flood of unvaccinated patients and are losing workers to burnout and lucrative out-of-state temporary gigs. Florida, Arkansas, Louisiana and Oregon all have more people hospitalized with COVID-19 than at any other point in the pandemic, and nursing staffs are badly strained.