COVID-19 cases jumped 18% last week and are at their highest levels since April, and the increase comes as the more transmissible Omicron BA.4 and BA.5 subvariants cause most infections, the World Health Organization (WHO) said today in its latest update.BA.4, BA.5 make up 55% of global samplesFour of the six WHO regions saw rises last week: the Eastern Mediterranean, Europe, Southeast Asia, and the Americas.
Globally, deaths stayed level, but were up in the Eastern Mediterranean, Southeast Asian, and Americas regions.About 4.1 million cases were reported to the WHO last week, likely an undercount given reduced testing in many countries.
The United States, Germany, Brazil, Italy, and China reported the most cases.At a briefing today of the WHO's Pan American Health Organization (PAHO), officials said cases rose in all four subregions in the Americas, with a jump of 24.6% in South America.
Cases in North America rose 7.7% last week, mainly due to rises in the United States and Mexico.The WHO said BA.4 and BA.5 subvariants continue to make up an increasing proportion of sequenced samples.