Global rise in Covid cases 'tip of the iceberg', says WHO

People walk past a sign for a Covid-19 vaccination centre amid the easing of lockdown restrictions in London. Reuters

Figures showing a global rise in Covid-19 cases could herald a much bigger problem as some countries also report a drop in testing rates, the World Health Organisation said on Tuesday, warning nations to remain vigilant against the virus.

After more than a month of decline, Covid-19 cases started to increase around the world last week, the WHO said, with lockdowns imposed in Asia and China's Jilin province as countries battle to contain outbreaks.

A combination of factors was causing the increases, including the highly transmissible Omicron variant and its cousin, the BA. 2 sub-variant, as well as the lifting of public health and social measures, the WHO said.

“These increase are occurring despite reductions in testing in some countries, which means the cases we're seeing are just the tip of the iceberg,” WHO's head Tedros Adhanom Ghebreyesus told reporters.

Low vaccination rates in some countries, driven partly by a “huge amount of misinformation” also explained the rise, WHO officials said.

New infections jumped by 8 per cent globally compared to the previous week, with 11 million new cases and a little more than 43,000 new deaths reported from March 7-13. It is the first rise since the end of January.

The biggest jump was in the WHO’s Western Pacific region, which includes South Korea and China, where cases rose by 25 per cent and deaths by 27 per cent.

Africa also reported a 12 per cent rise in new cases and a 14 per cent rise in deaths, while Europe registered a 2 per cent rise in cases but no jump in deaths.

Other regions reported declining cases, including the Eastern Mediterranean, although this area reported a 38 per cent rise in deaths linked to a previous spike in infections.

A number of experts have raised concerns that Europe is facing another coronavirus wave, with cases rising since the beginning of March in Austria, Germany, Switzerland, the Netherlands, and the UK.

The WHO's Maria Van Kerkhove said at the briefing that BA. 2 appears to be the most transmissible variant so far.

However, there are no signs that it causes more severe disease and no evidence that any other new variants are driving the rise in cases.

The picture in Europe is also not universal. Denmark, for example, experienced a brief peak in cases driven by BA. 2 in the first half of February, but infections quickly declined.

But experts have begun to say that the US could soon register a similar wave to that seen in Europe, potentially driven by BA. 2, with the lifting of restrictions and potential waning immunity from vaccines given several months ago.

“I agree with the easing of restrictions, because you can't think of it as an emergency after two years,” said Antonella Viola, professor of immunology at Italy's University of Padua.

“We just have to avoid thinking that Covid is no longer there and therefore maintain the strictly necessary measures, which are essentially the continuous monitoring and tracking of cases, and the maintenance of the obligation to wear a mask in closed or very crowded places.”