Comparing covid-19 vaccines: efficiency, safety and side effects Comparing covid-19 vaccines: efficiency, safety and side effects

Comparing covid-19 vaccines: efficiency, safety and side effects

Covid-19 vaccines: All you need to know

After 1.5 year of Covid-19 in our world, finally every country is moving forward toward the end of this pandemic with the help of Covid-19 vaccination. Most of the people are trying to get their vaccination as soon as possible but if you're still waiting for a covid-19 vaccine, watching the first people get their COVID-19 vaccines will give you a huge relief surely. As the weeks pass, countless reports are coming out about the effectiveness of new covid-19 vaccines that may be approved. 

Today we will get to know about Covid-19 vaccines effectiveness that are being used in all over the world.

Covid-19 Vaccines from Pfizer-BioNTech, Moderna, Sinopharm, Sinovac, CanSino-Bio, Sputnik and Johnson & Johnson are being used in the world right now. Even though you will likely not be able to choose which Covid-19 vaccine you will get, it’s still helpful to know how each one is different.

We will look at their effectiveness and other features one by one


On December 11, 2020, this became the first Covid-19 vaccine to receive an usage approval, after the company reported positive clinical trial data, which included news that the Covid-19 vaccine was up to 95% effective at preventing symptomatic disease.

Status: Emergency use in the U.S.; authorized for use in the European Union

Recommended for: Anyone 12 or older.

Dosage: Two shots, 21 days apart

Effectiveness: 95 % 

Pfizer-BioNTech covid-19 vaccine side effects
Pfizer-BioNTech Covid-19 Vaccine

2. Moderna

Moderna’s Covid-19 vaccine was the second one authorized for emergency use in the U.S. after getting approval in December 18, 2020, about a week after the Pfizer covid-19 vaccine. Moderna is also an mRNA vaccine, using the same technology as the Pfizer-BioNTech one and with
similarly high efficacy at preventing symptomatic disease.

Status: Emergency use in the U.S.; authorized for use in the European Union.

Recommended for: Adults 18 and older.

Dosage: Two shots, 28 days apart

Effectiveness: 94.1 %

Moderna Covid-19 Vaccine

3. Johnson & Johnson

By comparing to the Pfizer and Moderna covid-19 vaccines, this one is easier to store (in refrigerator temperature), and requires only a single shot, which has made it easier to distribute and administer. An analysis released by the FDA  of US in late February showed that the vaccine may reduce the spread of the virus by vaccinated people.

However its side effects are a lot more than those two above mentioned. It has been reported that there are major blood clotting issues in some people after getting this Covid-19 vaccine so there is a warning given to people getting this vaccine by authorities.

Status: Emergency use in the U.S.; authorized for use in the European Union

Recommended for: Adults 18 and older.

Dosage: Single shot

Effectiveness: 72% overall efficacy and 86% efficacy against severe disease in the U.S.

4. Oxford-AstraZeneca

This Covid-19 vaccine is currently being distributed in the United Kingdom and other countries. The main points of this vaccine are its lower cost—it’s cheaper to make per dose, and it can be stored, transported, and handled in normal refrigeration for at least six months.

Status: Approved by European Union and using in UK and other

Recommended for: Adults 18 and older

Dosage: Two doses, four to 12 weeks apart

Effectiveness: 76-100 %

5. Novavax

This Covid-19 vaccine has been shown to be effective not only against COVID-19, but also against the mutations that have emerged in Great Britain and South Africa. It is also simpler to make and can be stored in a refrigerator.

Status: Still completing clinical trials

Recommended for: This covid-19 vaccine is being studied in adults ages 18-84

Dosage: 2 doses, three weeks apart

Effectiveness: 96.4 %

6. Sinopharm

Sinopharm, a Chinese state-owned company, is developing two Covid-19 vaccines, which are inactivated covid-19 vaccines that work in a similar way. Sinopharm announced on 30 December that phase three trials of the vaccine showed that it was 79% effective - lower than that of Pfizer and Moderna. However, the United Arab Emirates, which approved a Sinopharm vaccine earlier this month, said the  covid-19 vaccine was 86% effective, according to interim results of its phase three trial.

Status: Currently being used in China, Latin America, Africa and asian countries

Recommended for: 18 year and above

Dosage: 2 doses, 3–4 weeks between the first and second dose

Effectiveness: 79 %

Sinopharm vaccine side effects
Sinopharm  vaccine

7. Sinovac

China is leading the race in Covid-19 vaccines as its two covid-19 vaccines are being used all over the world. 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.

Moderna's covid-19 vaccine needs to be stored at -20C and Pfizer's vaccine at -70C.

Status: The vaccine is approved for use in China and authorized for emergency use in more than a dozen other countries.

Recommended for: 12 and above (According to Sinovac)

Dosage: 2 doses. Second dose 28 days after first

Effectiveness: 95 %

Sinovac vaccine side effects
Sinovac vaccine by china

So Bottom line is that covid-19 vaccines are being developed in all over the world as days are passing by but after analyzing these 7 popular and most effective covid-19 vaccines thus far we can say that Chinese Covid-19 vaccines are most effective and easy to store. This made Chinese vaccines more efficient than British or US vaccines as developing countries can also get these Chinese vaccines at lowest cost and they also don't have to face storage problems for these vaccines unlike pfizer or moderna. I will continue to add new Covid-19 vaccines as soon as they are approved by concerning authorities.

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