As countries around the world relax Covid-19 restrictions and some areas see an increase in infections, questions are being raised about whether the pandemic is entering what is known as a second wave.
In the United States, where new cases had levelled off at roughly 20,000 a day for a period of weeks, infections have again spiked.
The US on Friday reported one of its largest single-day increases since the start of the pandemic, with more than 40,000 new cases on the previous day, according to data from the Centres for Disease Control and Prevention.
On Thursday, the World Health Organisation’s regional director for Europe Hans Kluge said 30 countries and territories in the region had seen increases in new cumulative cases in the past two weeks as they eased social distancing measures, with 11 of those experiencing a “significant resurgence”.
But whether this means such areas are seeing a second wave remains unclear, largely due to the ambiguity of the term, experts say.