Vaksin China spt Sinovac dibuat berdasarkan cara konvensional dgn menggunakan protein dari virus yg telah dimatikan. Mungkin krn itulah harganya lebih mahal.
Sedangkan vaksin2 keluaran Inggris, Amerika dan Rusia memakai tehnik rekayasa genetik.
The Beijing-based biopharmaceutical company Sinovac is behind the CoronaVac, an inactivated vaccine.
It works by using killed viral particles to expose the body’s immune system to the virus without risking a serious disease response.
By comparison the Moderna and Pfizer vaccines being developed in the West are mRNA vaccines. This means part of the coronavirus’ genetic code is injected into the body, triggering the body to begin making viral proteins, but not the whole virus, which is enough to train the immune system to attack.
“CoronaVac is a more traditional method [of vaccine] that is successfully used in many well known vaccines like rabies,” Associate Prof Luo Dahai of the Nanyang Technological University told the BBC.
“mRNA vaccines are a new type of vaccine and there is [currently] no successful example [of them] being used in the population,” Prof Luo adds.