China's CanSino Biologics will be starting clinical trials for a Covid-19 vaccine that is administered through inhalation next week, the company's co-founder and Chief Executive Xuefeng Yu told CNBC on Sunday.

Efficacy rates for China's Covid vaccines have been found to be lower than those developed by Pfizer-BioNTech and Moderna. Earlier this month, the director of the Chinese Center for Disease Control publicly acknowledged that Chinese vaccines "don’t have very high protection rates" and that they were considering giving people different Covid shots to boost vaccine efficacy.

Yu told CNBC that an inhaled vaccine could be more effective than those injected given that the coronavirus enters the human body through the airways.

CanSinoBIO is jointly developing the inhalation vaccine with the Beijing Institute of Biotechnology. To be clear, the company's Adenovirus Type 5 Vector vaccine — or Ad5-nCoV — administered by injection was already approved for use in China and several other countries.

People receiving Covid-19 shots at a temporary vaccination site on April 15, 2021 in Kunming, Yunnan Province of China.

Liu Ranyang | China News Service | Getty Images

Speaking to CNBC's Arjun Kharpal at the Boao Forum for Asia in the Chinese province of Hainan, Yu explained that theoretically, an inhaled vaccine could provide additional protection by activating antibodies or T cells — white blood cells that are vital to the immune system — in the airways.

If that protection layer fails and the virus travels deeper into the body, other parts of the immune system could still fight the Covid virus, added Yu.

"So you add more layers — makes sense, right? So that's why we're going through the mucosal route," he said.

The CEO said the company has used the same concept to develop an inhalation vaccine for tuberculosis or TB. Trials conducted in Canada showed that the inhaled dosage for the TB vaccine needed to provide protection is "much, much less than the actual injection," he said.

Boosting vaccine efficacy

"That's also indicating that our vaccine could be boosted — whether it's being mixed with others or do it our own, I think that needs truly a scientific study. We need to actually have data to demonstrate which way could be better," said the CEO.

Reuters reported on Monday that Chinese researchers are testing mixing Covid vaccines developed by CanSinoBIO and a unit of Chongqing Zhifei Biological Products. The trial, under way in the eastern city of Nanjing, is expected to involve 120 participants, said the report.

China was the first country to report cases of Covid-19 in late 2019 and appears to have largely contained the outbreak. The country has said it aims to vaccinate 40% of its population by June.

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