https://www.nytimes.com/interactive/2020/health/sinopharm-covid-19-vaccine.htm
https://www.bbc.com/news/health-55302595
https://www.reuters.com/article/us-health-coronavirus-sinopharm-peru-idUSKBN29V2FD
Sinopharm-A Vaccine Made From Coronaviruses-BBIBP-CorV works by teaching the immune system to make antibodies against the SARS-CoV-2 coronavirus. The antibodies attach to viral proteins, such as the so-called spike proteins that stud its surface.
Astrazeneca-It is made from a weakened version of a common cold virus (known as an adenovirus) from chimpanzees. It has been modified to look more like coronavirus - although it can't cause illness.Once injected, it teaches the body's immune system how to fight the real virus, should it need to.