Top officials from the World Health Organization (WHO) said today that COVID-19 cases have climbed for the seventh week in a row, warning that masks, distancing, and other measures are needed to give vaccines a chance to reduce transmission.At a briefing today, WHO Director-General Tedros Adhanom Ghebreyesus, PhD, said last week marked the fourth highest COVID total in a single week, despite the fact that 780 million doses of vaccine have been given across the globe. "Make no mistake, vaccines are a vital and powerful tool," Tedros said. "But they are not the only tool."Exponential global case growthMaria Van Kerkhove, PhD, the WHO's technical lead for COVID warned that the pandemic has reached a critical point, with cases growing