In some of first real-world findings on Omicron's impact in South Africa, researchers found a drop in Pfizer vaccine effectiveness against hospitalization, but also a drop in hospitalizations, another early hint that infections might be less severe.However, World Health Organization (WHO) officials today aired worries that countries are dismissing the Omicron (B.1.1.529) variant as mild and are relying too much on vaccines to blunt expected surges.WHO: Omicron spreads unlike any other variantTedros Adhanom Ghebreyesus, PhD, the WHO's director-general, said Omicron is spreading at a rate not seen with any previous variant, and officials are concerned that people are dismissing Omicron as mild.