In its weekly snapshot of global COVID-19 activity, the World Health Organization (WHO) said yesterday that new cases rose for the fifth week in a row, an increase that now includes all six of its regions, with deaths accelerating for the second straight week.In other developments, expert groups that continue to weigh potential side effects of the AstraZeneca-Oxford vaccine said benefits still outweigh the risks, and the WHO today said that ivermectin should only be used to treat COVID-19 within clinical trials.Cases trend up in all parts of globeIn its latest situation report, the WHO said of the more than 3.8 million cases added to the global total last week, the five countries reporting the most were Brazil, the United States, India,