FILE PHOTO: Small bottles labeled with a "Vaccine COVID-19" sticker and a medical syringe are seen in this illustration taken taken April 10, 2020. REUTERS/Dado Ruvic/Illustration/File Photo
BEIJING (Reuters) - A coronavirus vaccine candidate China is developing may not be ready for sale until at least 2021, as researchers struggle to move into large-scale human trials in the country because of a lack of new infections, a senior company executive said.
More than 10 experimental vaccines are being tested in humans globally as scientists race to protect against the novel coronavirus that has killed more than 450,000 people.
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