An Indian Covid-19 vaccine, Covishield under its final trial phase

in Project HOPE5 months ago (edited)

Image by Gerd Altmann from Pixabay

Serum Institute of India(SII) has developed a vaccine, Covishield. This vaccine is now in its final trial phases in India with the vaccine getting evaluated for its effectiveness and resulting side effects. The ongoing trials are conducted on 1600 participants with the vaccine administered on them and examined.

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Covishield vaccine is derived from master seeds of vaccine AZD1222

Covishield is developed using the master seeds of vaccine AZD1222, that’s developed by Swedish-British company AstraZeneca along with the University of Oxford.

A peek at AZD1222 vaccine’s effectiveness

Image by Alexandra_Koch from Pixabay

AZD122’s effectiveness has been reported by the above entities who developed the vaccine based on the outcome of trials conducted on participants in the UK and Brazil. The report revealed that the effectiveness of the vaccine varied according to the dosage administered.

In the first case scenario where half a dose of AZD122 vaccine was first administered with another full dose of vaccine given out the next month, the efficacy was 90%.

In the second case scenario, when 2 full doses of the AZD122 vaccine got administered with a month’s gap between each dose, the efficacy was 62%.

This means that the dosage of half the vaccine accompanied by a full dose a month later was 90% effective in protecting those administered from getting Covid-19, while the dosage where 2 full doses of the vaccine was administered a month apart was only 62% effective in protecting those administered from getting Covid-19.

There is a ongoing study on the possible reason for this outcome where there is variance in the effectiveness of the AZD122 vaccine when the doses are administered the above explained way. Experts feel that when half a dose is given initially it readies the body’s system to fight Covid-19 better, and later the body system’s response to a full dosage of the AZD122 vaccine gets strong thus being 90% effective in preventing Covid-19 from effecting the vaccine administered person.

On the other hand, it’s possible that initially when 1 full dose of the AZD122 vaccine is administered, it exhausts the body system so when another full dose is given a month later, the body’s immune response is not very strong to fight Covid-19. Therefore, in this scenario, the AZD122 vaccine is only 62% effective in protecting the vaccinated person from getting Covid-19.

The effectiveness of Covisheid vaccine is to be seen

Image by Alexandra_Koch from Pixabay

It is to be seen how effective Covisheid is in its immunogenicity, that is its capacity in triggering the body’s immune response. It is possible that its performance may be similar to the AZD122 vaccine.

For a Covid-19 vaccine to be approved by the Indian Drug Regulator, it has to show that the effectiveness of the vaccine is 30%-50%. As of now since India does not have any Covid-19 vaccine, a vaccine that has the above mentioned efficiency percentage should not have a problem in getting approvals from the Indian Drug Regulator for its use on the population.

Right now, if Covisheild should prove to have just 60% efficacy, it’s good enough, but a year later when other vaccines with better efficacy come by, it would have competition in the space and may not sustain in the market.


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"Experts feel"

It seems like they need some new experts.

yeah, the reason for the difference in effectiveness is still under study

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Hello friend, the truth has been waiting for this vaccine for a long time, we still do not know for sure by when we will all be able to obtain said vaccine, but we are still waiting for all that to be resolved as soon as possible. And of course, that it will be accessible to the entire population.

Yes, its great that some promising news of vaccines are coming by!!

At the beginning of 2021, we might receive the vaccine.

First, front line workers will be given, then normal population would get it. I am dissapoointed that effectiveness has to be just 30-50% for the vaccine to be approved you know.

Good article, I imagine that the creation of vaccines as the big business of this year 2020 already go as 4 vaccines that are in final stage or are already ready for distribution

yup... its hot topic now, vaccine news and positive results are encouraging for sure. But can't be certain you know, it's all fast tracked after all, more time may be required to study its effects and how long the vaccine would be effective and all.


We have been waiting a long time for such a vaccine, although science has advanced a lot with this subject, we have not yet achieved the expected final result.

Let's hope in God that everything goes well and that the vaccine that can help us all finally arrives.

Thank you for sharing your article.

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