BEIJING -- Clinical trials of China-developed nasal spray and inhaled COVID-19 vaccines are currently underway, according to the National Health Commission.

The nasal spray has been selected as one of China's vaccine technologies to combat COVID-19 in the very beginning, Zeng Yixin, deputy head of the commission, said in a recent interview.

Medical experts will study the safety and effectiveness of the tested vaccines after completing the collection of clinical trial data, Zeng added.