FLENSBURG, GERMANY - FEBRUARY 22: A lab technician is working on smears for PCR tests for Covid-19 during the coronavirus pandemic on February 22, 2021 in the Labor Dr. Krause & Kollegen laboratory in Kiel, Germany. The B117 variant of the novel coronavirus is now accounting for the vast majority of new infections in Flensburg, leading city authorities to launch a nighttime curfew and sharpen other lockdown measures. Meanwhile Denmark has closed a number of its smaller border crossings to Germany in an effort to stem the spread of the B117 variant. (Photo by Morris MacMatzen/Getty Images)