The world's number of new COVID-19 cases rose for the sixth week in a row, as vaccine experts continue to weigh reports of rare blood clot conditions in people who have received the AstraZeneca-Oxford vaccine.Hot spots in multiple regionsIn its weekly snapshot of COVID-19 activity, the World Health Organization (WHO) said 4 million new cases were reported last week, with deaths on the rise for the third week in a row.The five countries reporting the highest case numbers shifted last week, with India reporting the most, followed by Brazil, the United States, Turkey, and France.The part of the world that felt the biggest case increase was the WHO's South-East Asia region, which includes India, followed by the Western Pacific region, which