(HealthDay News) — While researchers explore the possibilities of COVID-19 vaccines that do not require an injection, public health officials in India and China have each approved new needle-free versions for their citizens.

In India, regulators approved a nasal vaccine developed in the United States, manufactured by the company Bharat Biotech, and intended for people who have not yet been vaccinated. It is not clear how well this vaccine works because the company has not yet released study results, but the company has also applied for the spray to be used as a booster. A timeline for the nasal spray’s rollout was also not available, the Associated Press reported.

“This step will further strengthen our collective fight against the pandemic,” Indian Health Minister Mansukh Mandaviya said on Twitter.

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The vaccine was developed by scientists at Washington University in St. Louis who licensed it to the Indian company. The vaccine delivers a copy of the coronavirus spike protein to the nasal lining, delivered using a harmless chimpanzee cold virus. Trials included two doses of the vaccine for 3,100 unvaccinated volunteers and a booster for 875 people who had already received two COVID-19 shots.

In China, the needle-free vaccine is an inhaled version of CanSino Biologics’ existing COVID-19 shot that is meant to be a booster dose. The company said preliminary study results showed just one puff increased immune protection, but it was not clear if that meant improved effectiveness, the AP reported. The Chinese vaccine uses a harmless human cold virus and was tested as a booster on people who had received COVID-19 shots from another Chinese company. A timeline for this vaccine’s rollout was also not known.

The interest in a shot-free vaccine is part of a strategy to improve protection against infection by placing the doses directly where the virus enters the body, such as in the nose or mouth. In some low-income countries, using something other than a shot may also be easier for storage and delivery, Michael Diamond, M.D., from Washington University told the AP. Diamond helped create the spray licensed in India.

Associated Press Article