Chinese firm Sinovac Biotech Ltd said on Monday its coronavirus vaccine candidate appeared to be safe for older people, according to preliminary ...
A staff member places a coronavirus vaccine candidate from Sinovac Biotech at its booth for display during the 2020 China International Fair for Trade in Services , following the COVID-19 outbreak, in Beijing, China, on Sep 5, 2020.
Health officials have been concerned about whether experimental vaccines could safely protect the elderly, whose immune systems usually react less robustly to vaccines, against the virus that has led to nearly 890,000 deaths worldwide.Sinovac's candidate CoronaVac did not cause severe side effects in a combined Phase 1 and Phase 2 trials launched in May involving 421 participants aged at least 60, Liu Peicheng, Sinovac's media representative, told Reuters.
For three groups of participants who respectively took two shots of low, medium and high-dose CoronaVac, over 90 per cent of them experienced significant increase in antibody levels, while the levels were slightly lower than those seen in younger subjects but in line with expectation, Liu said in a statement.
The potential vaccine could remain stable for up to three years in storage, Liu said, which might offer Sinovac some advantage in vaccine distribution to regions where cold-chain storage is not an option. Such estimation is extrapolated from the fact that vaccines readings stayed within acceptable ranges for 42 days at 25 degrees Celsius, 28 days at 37 degrees Celsius, and five months for 2-8 degrees Celsius, Liu said, without disclosing complete data.
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