With the world well into its third surge, COVID-19 cases rose last week for the seventh week in a row, led by spikes in the Americas and Western Pacific regions, with deaths up sharply in the latter, the World Health Organization (WHO) said in its weekly snapshot of the pandemic.In other developments, the WHO announced the next phase of the Solidarity treatment trial, which will evaluate three already existing drugs.Patterns and burden shift with Delta now in 142 countriesIn its weekly update, the WHO said the five countries reporting the most cases last week include the United States, India, Iran, Brazil, and Indonesia.