In order to ensure that the vaccines arrive on time with quality guaranteed, the two drivers took turns behind the wheel. Cold chain storage and transportation ensure that the vaccine is safe. Each vaccine transport vehicle is equipped with a temperature monitoring system to ensure that it is always maintained at 2-8 C. Along the way, the drivers constantly check the data.

On the afternoon of July 22, after more than 40 hours of driving, the duo arrived at the local center for disease control on time and handed over the vaccine to the local CDC staff.

Next, Huang Liang, a staff member of the Ganzi prefecture CDC, was responsible for sending the vaccines to remote counties and townships. In order to reach the farthest county and township before the evening of the next day, Huang set off overnight, crossing the Zheduo Mountains at an altitude of more than 4,000 meters, passing the Dadu River, and heading west along the No 318 national road.