Various COVID 19 vaccines in 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.
On paper, one of Sinovac’s main advantages is that it can be stored in a standard refrigerator at 2-8 degrees Celsius, like the Oxford vaccine, which is made from a genetically engineered virus that causes the common cold in chimpanzees.1
While the three COVID-19 vaccines – from Pfizer/BioNtech, Moderna and Oxford/AstraZeneca – look set to be the most common ones for Europeans.
While they all have the same goal, there are substantial differences between the jabs, from their composition and reported effectiveness, to their price and ease of conservation and distribution.
It means that both Sinovac and the Oxford-AstraZeneca vaccine are a lot more useful to developing countries that might not be able to store large amounts of vaccine at such low temperatures.
Pfizer/BioNtech and Moderna
The Pfizer vaccine, like the Moderna one, use innovative messenger RNA technology. In short, this technology teaches our cells how to produce a protein, which is what makes the immune system react.
It is claimed their efficiency in successfully fighting COVID-19, at up to 95%, is higher than that of AstraZeneca.
Both, however, are more expensive.
The big drawback of Pfizer’s jab is that it needs to be stored in the extreme cold, at temperatures as low as -70C to -80C. Moderna’s can remain stable for 30 days at a temperature of between 2C and 8C, but for longer periods it will have to be frozen at -20C.
Compared to Pfizer and Moderna, AstraZeneca’s jab uses a more traditional vaccine technique, using an attenuated version of the virus that causes the common cold in chimpanzees.
This virus has been genetically altered with a gene for a coronavirus protein to provoke the body’s immune reaction.
Its efficiency rate is lower at around 70%. But, under certain conditions, this can be as high as 90%.
But it is a lot cheaper and easier to store than Pfizer’s vaccine. The AstraZeneca vaccine can survive in a standard refrigerator for up to six months, whereas the Pfizer one needs temperatures of up to -80℃.2
That’s all for the various covid 19 vaccines hope this article help you!