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| Primary schools students line up for a school bus in Hong Kong, Tuesday, Jan. 11. AP-Yonhap |
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In Hong Kong, for example, the government has approved Sinovac's vaccine for children as young as 5 and an advisory panel has recommended that small doses of BioNTech be approved for the same age group.
China set a target last year to vaccinate all children aged between three and 11, while Europe and the United States also started child vaccination drives.
The number of children infected with Omicron has been on the rise in the past month or so, including in mainland China.
A large number of the initial cases in an Omicron outbreak in Tianjin and Henan province were children, prompting the authorities to assure the public that children were not at greater risk from the strain compared with adults.
Terence Stephenson, a professor at the Great Ormond Street Institute of Child Health at University College London, said: "I think the reason we're seeing large numbers of children is that in most countries, immunization of children is at a lower level than that of adults."
Emily Ying-yang Chan, professor and assistant dean at the faculty of medicine, the Chinese University of Hong Kong, said the rise of children cases could have to do with how they interact, particularly in schools.
"There is no scientific evidence saying Omicron affects children more than other variants," she said.
Zhang Boli, a COVID-19 specialist and president of the Tianjin University of Traditional Chinese Medicine, said last Tuesday: "At the beginning [in Tianjin] there were more children, but now there are many adults too. It is not because children are more susceptible ― it was only because the outbreaks started in childcare facilities."
Zhang said that of the two dozen children infected in Tianjin, half were asymptomatic, while others had mild symptoms.
"A few of the children had a fever but the temperature was not too high and other common symptoms were coughs and sore throats," Zhang said.
Stephenson said most children only suffered mild symptoms.
"One of the paradoxes of the whole pandemic is that from the very beginning through Alpha, Delta and Omicron, children have always been a large reservoir of infection," he said.
"The rate of infection has been quite high, but the risk of being very ill has been very low. So if I take England as an example, there's only been about 250 children admitted to pediatric intensive care, of whom only 20 didn't have some pre-existing disease that made them vulnerable.
"It's only about 20 healthy children admitted to intensive care. And if we compare that to adults, where they've been something like 170,000 deaths... [it] has been quite a mild disease."
Some preliminary data suggests hospitalization rates for children suffering from Omicron could even be lower than Delta, including a non-peer-reviewed study from Case Western Reserve University in Cleveland.
Some scientists are monitoring if children can suffer from "long COVID," or lingering symptoms for months after being infected.
Stephenson is leading the Children and Young People with Long COVID (Clock) study, the largest of its kind, which has monitored around 20,000 patients aged between 11 and 17.
It said 14 per cent of around 20,000 patients aged 11 to 17 still have symptoms after 15 weeks.
Though younger children are not included in the study, Stephenson said: "In general, pediatricians would recognize that post-viral syndromes are more common in teenagers and young children ... mostly it's teenagers who get long-term symptoms, not young children."
Stephenson said: "Whilst the SARS-CoV-2 doesn't make children very ill, it does disrupt their life ... And I think one of the big arguments has been that after two years of a pandemic, with children's education and development being so disrupted, that one of the big arguments for vaccination is that it stops them having to isolate and be absent from school and I think that's a perfectly good reason."
He also said COVID-19 was similar to diseases such as the flu, for which vaccinating children could stop them from passing it on to the elderly and other vulnerable groups.
White House chief medical adviser Anthony Fauci said recently that vaccinations could help reduce the risk to children with underlying conditions, saying last week that it was "inevitable" some would end up hospitalized as infections increased.
There is no COVID-19 vaccine specifically for children and they usually receive smaller doses of existing vaccines.
In mainland China, children as young as 3 can be vaccinated with Sinovac or Sinopharm, while the U.S., Europe and Singapore have all approved the Pfizer/BioNTech vaccines for those aged 5 and over.
Meanwhile, Moderna has been conducting a trial on children aged between 2 and 5 and expects to report data in around two months' time.
"If the data is supportive and subject to regulatory consultation, Moderna may proceed with regulatory filings for children between 2 and 5 years of age thereafter," the company said.
It has also submitted an application in the U.S. for its vaccine to be approved for children aged 6 to 11.
