COVID-19 Vaccines

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What is COVID-19?

The novel COronaVIirus (SARS-CoV-2) are a large family of viruses outbreak first identified in China (december 2019), It spreads through the air through droplets produced when people cough, sneeze or talk. The COVID-19 pandemic is a global crisis, causing over 2 millions deaths, The U.S. and brazil are the countries most affected.

After a year, 9 February 2021, almost 110 770 000 confirmed cases of COVID-19, more 2 340 500 deaths, Coronavirus vaccines are developed for to protect us from spreading the virus.

Symptoms of COVID-19

  • Fever
  • Cough
  • Headache
  • Breathing difficulties
  • Sore throat
  • Loss of taste or smell
  • Repeated shaking with chills
  • Gastrointestinal symptoms
  • Muscle aches and pains
covid-19 symptomps

What is the COVID-19 vaccine?

The novel coronavirus (SARS-CoV-2) that causes COVID-19 has spikes of protein on each viral particle. The fight against COVID-19 has seen vaccine development move a record speed, than ever before for an infectious disease: All of them are trying to achieve the same thing ” immunity to the virus”.

This vaccine is a substance that should improve immunity to a COVID-19, vaccines help people develop immunity to a virus , this will limit spread through communities. Most people are able to get the COVID-19 vaccine, some others should consult with their doctor.
How do vaccines work?


A vaccine introduces a less harmful part of thatvirus into a person’s body. The body’s immune system develops antibodies that fight that particular germ and keep the person from getting sick from it. Later, if the person encounters that germ again, their immune system can “recognize” it how to fight it off.

Side effects of COVID-19 vaccines

In large clinical trials, most side effects have been minor. they are temporary and an indication the vaccine is working and the body is building protection against the virus.

You may experience minor side effects following vaccination, in the first three days after vaccination. There may be fever, redness, headache, fatigue, swelling or pain around the injection site. A side effect or reaction isn’t necessarily all bad.

For the three vaccines AstraZeneca, Moderna and Pfizer/BioNTech, common side effects include:

  • headache
  • fever or chills
  • tiredness
  • nausea and vomiting
  • muscle aches
  • joint pain

Different COVID-19 Vaccines

Authorized and Recommended Vaccines

After confirming the use of Pfizer and BioNTech’s, Moderna’s is the second Covid-19 vaccine approved The Food and Drug Administration (FDA) for use in the United states. U.S. governoment hope to vaccinate at least 30 million Americans by the end of April 2021

Pfizer-BioNTech COVID-19 vaccine

The Pfizer-BioNTech COVID-19 mRNA vaccine (produced by BioNTech Manufacturing GmbH) is a white to off-white frozen solution. The vaccine is 95 percent effective at preventing Coronavirus, is approved for people who are 16 years of age and older. Pfizer-BioNTech vaccine requires two doses to be inject into the muscle (3 weeks apart).

Type: mRNA
Efficacy: About 95%
Price: $19.50/Dose (2 doses)
Variants: Suggested effective against the UK variant, Brazilian and the South African variants.

Moderna’s COVID-19 vaccine

The Moderna COVID-19 Vaccine (mRNA-1273) is an vaccine which was developed by Moderna (Massachusetts-based vaccine developer) and National Institute of Allergy and Infectious Diseases’ (NIAID) Vaccine Research Center. This vaccine contains a modified molecule called messenger RNA for producing a “S” protein from SARS-CoV. A very large clinical trial demonstrated that the Moderna COVID-19 Vaccine has an efficacy rate of 94% at preventing coronavirus in people from 18 years of age.

Type: mRNA
Efficacy: About 95%
Price: $25/Dose (2 doses)
Variants: Suggested effective against the UK variant, Brazilian and the South African variants.

Oxford/AstraZeneca COVID-19 vaccine

Oxford-AstraZeneca vaccine (AZD1222), approved for use in U.K by the MHRA , this vaccine is a «viral vector» vaccine, was developed in around 10 months by the University of Oxford and the British pharmaceutical company AstraZeneca Plc. Mexico, India and Brazil have approved the Oxford-AstraZeneca vaccine for emergency use (january 2021).

Type: Adenovirus
Efficacy: About 70%
Price: 5$/Dose (2 doses)
COVID-19 Vaccines

Vaccines in Phase III

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