The Chinese city of Shanghai has begun using the world's first inhalation vaccine against coronavirus. The oral vaccine is offered free of charge in the PRC as a booster dose for those vaccinated, AP reported. Scientists hope that such "needle-free" vaccines will make vaccination more affordable in countries with weak health care systems because they are easier to administer. It will also help convince people who are afraid of shots to get vaccinated. As of mid-October, 90% of Chinese people had been fully vaccinated and 57% had received a booster dose. A published video shows people inserting a short nozzle of a translucent white cup into their mouths at a community health center. The accompanying text noted that after taking a slow breath, people hold their breath for five seconds and the entire procedure is completed in 20 seconds. The vaccine was developed by Chinese biopharmaceutical company Cansino Biologics and is an aerosol version of the company's adenovirus vaccine. It was approved by Chinese regulators in September after completing trials in China, Hungary, Pakistan, Malaysia, Argentina and Mexico.