which is the best vaccine for covid 19 ? Sputnik V, Covishield, Covaxin: What we know about India's Covid-19 vaccines from WHAT BBC TELLS US?

 

 

Sputnik V :

The vaccine, developed by Moscow's Gamaleya Institute, initially generated some controversy after being rolled out before the final trial data had been released.

But scientists say its benefits have now been demonstrated.

It uses a cold-type virus, engineered to be harmless, as a carrier to deliver a small fragment of the coronavirus to the body.

Safely exposing the body to a part of the virus's genetic code in this way allows it to know the threat and learn to fight it off, without the risk of becoming ill.

After being vaccinated, the body starts to produce antibodies especially tailored to the coronavirus.

This means that the immune system is primed to fight coronavirus when it encounters it for real.

 Second dose :

Unlike other similar vaccines, the Sputnik jab uses two slightly different versions of the vaccine for the first and the second dose - given 21 days apart.

They both target the coronavirus's distinctive "spike", but use different vectors - the neutralized virus that carries the spike to the body.

The idea is that using two different formulas boosts the immune system even more than using the same version twice - and may give longer-lasting protection.

 About Covaxin?

Covaxin is an inactivated vaccine which means that it is made up of killed coronaviruses, making it safe to be injected into the body.

The vaccine has an efficacy rate of 81%

 Covishield?

The vaccine 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.

When the vaccine is injected into a patient, it prompts the immune system to start making antibodies and primes it to attack any coronavirus infection. when people were given a half dose and then a full dose, effectiveness hit 90%.