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China's largest city, Shanghai, has ordered most of its schools to take classes online as Covid cases soar.

Nurseries and childcare centres will also shut from Monday, according to Shanghai's education bureau.

Restrictions were eased by Chinese authorities earlier this month following a wave of protests targeting China's zero-Covid strategy.

But the easing of strict lockdown measures has led to growing concerns over the spread of Covid in China.

Significant changes in the country's Covid testing and reporting systems have made it difficult to know just how widespread the virus has become, with data for the week ending 11 December showing a fall in the total number of new infections across the country after peaking the previous week.

But prior to the change in data collection, the number of cases was higher than that of the last Covid wave in April.

Hospitals and medical facilities have come under increasing strain, with temporary health centres and intensive care facilities being set up across the country.

In Shanghai, it has been reported that an extra 230,000 hospital beds have been made available.

Some schools in the city have also already stopped in-person classes because teachers and staff are ill.

In posted on Chinese social media site WeChat on Saturday, Shanghai's education bureau announced that most year groups in primary and secondary schools would move to online learning from Monday.

Students and children who do not have alternative childcare arrangements can apply to attend school.

The statement said the measures were being put in place in order to protect the health of teachers and students in line with current coronavirus prevention measures.

The decision means that schools in the country's financial hub will be closed for in-person learning until the end of term on 17 January, when the Lunar New Year holiday starts.

Some Chinese social media users praised the decision, agreeing that it was best that students stay at home. Others complained about the efficacy of online learning in relation to in-person teaching and the extra strains put on working parents.

Following its abandonment of its zero-Covid strategy, there has been an explosion of self-reported cases across the country, with many cities eerily quiet as large numbers of people isolate at home, either sick with Covid or trying to avoid becoming infected, reports the ����ý's Celia Hatton.

There are concerns that China's health infrastructure is not prepared to cope with a rapid increase in patients - especially as Covid spreads among the elderly, many of whom are not fully vaccinated.