Chinese Covid vaccine booster 'could upgrade shot against variants'

There are concerns that vaccines being used around the world could be less effective against variants of the Covid-19 virus now being seen in the UK and South Africa

A health worker prepares to administer the Sinovac vaccine against the Covid-19 coronavirus at Zainoel Abidin Hospital in Indonesia. AFP

China's Covid-19 vaccines using the inactivated virus can be upgraded to cope with new variants in about two months, according to a Chinese medical expert.

Shao Yiming, a scientist with the Chinese Centre for Disease Control and Prevention agency, was speaking to the Global Times, in a report published on Tuesday.

There are concerns that vaccines developed over the past year may be less effective again new variants of Covid-19 discovered recently in the UK and South Africa.

Biotech company Moderna said on Monday it would test a new booster shot aimed at the South African variant, after concluding the antibody response could be diminished.

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  A medical worker collects a swab sample from a woman during a Covid-19 test in Bekasi, Indonesia. Reuters

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  A man shows his disposable gloves on a street in Bangkok, Thailand. AFP

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  A healthcare worker takes a nose swab for an attendee's Covid-19 antigen rapid test before a conference held by the Institute of Policy Studies at Marina Bay Sands Convention Centre in Singapore. Reuters

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  A biochemist works on a XAV-19 anti-Covid treatment as part of a clinical trial run at the Xenothera Biotech laboratory at Nantes University Hospital in western France. AFP

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  Students at a school where a Covid-19 cluster broke out, get on a bus to head to a makeshift clinic, in Daejeon, South Korea. EPA

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  A group of young people hold a coronavirus-themed board during the Republic Day celebrations in Secunderabad, the twin city of Hyderabad. AFP

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  People sit in a bus as lantern decorations are reflected on a window ahead of the Chinese Lunar New Year holiday in Beijing, China. Reuters

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  Signs encouraging preventative measures against the spread of Covid-19 are seen in Del Mar, California, USA. Bloomberg

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  The Smoothie King Center arena in New Orleans, Louisiana, is sanitised after players from both New Orleans Pelicans and San Antonio Spurs tested positive for Covid-19. Reuters

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  People stand at the Odaiba waterfront as the Olympic rings are seen in the background in Tokyo. AP Photo

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  A woman walks under decorative umbrellas in Taguig, Philippines. AP Photo

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  Healthcare workers look out to the Mediterranean sea outside the Hospital Del Mar in Barcelona. AFP

Vaccines from Sinovac Biotech and China National Pharmaceutical Group (Sinopharm) are being used in China and overseas. The Sinopharm vaccine is approved for use in the UAE.

These vaccines contain the inactivated virus that cannot replicate in human cells.

The neutralising ability of antibodies induced by Chinese vaccines, which were developed in accordance with the variant spreading in Wuhan city in late 2019, appeared weaker against recently discovered variants in the UK and South Africa, the Global Times quoted Mr Shao as saying.

He cited studies by Chinese vaccine companies and labs.

The redesign of inactivated Covid-19 vaccines could take longer than for vaccines based on mRNA technology, which does not require cultivating and inactivating the virus, according to Mr Shao, who participates in technical reviews of China's Covid-19 vaccines.

The mRNA technology is used in vaccines developed by Pfizer-BioNTech and Moderna.

The Global Times is published by the People's Daily, the official newspaper of China's ruling Communist Party.