![Countries across the world are currently rolling out three main versions of the COVID-19 vaccine from Pfizer, Moderna and AstraZeneca. The first vaccines were administered in December, with plans to complete a large portion of the rollout throughout 2021.](https://harkeraquila.com/wp-content/uploads/2021/01/Screen-Shot-2021-01-15-at-4.15.07-PM-900x511.png)
Comparing the COVID-19 vaccines: Pfizer, Moderna and AstraZeneca
by Sabrina Zhu, Assistant STEM Editor
• January 15, 2021
![After Pfizer and BioNTech received an Emergency Use Authorization (EUA) from the Food and Drug Administration (FDA) for their COVID-19 vaccine on Dec. 11, vaccinations have begun in all 50 states. Front-line workers and the elderly have been prioritized to receive the vaccine first.](https://harkeraquila.com/wp-content/uploads/2021/01/unnamed-6.png)
How the Pfizer vaccine works: A breakdown
by Sabrina Zhu and Mark Hu
• January 6, 2021
![The US Food and Drug Association gave full approval to the Pfizer-BioNTech COVID-19 vaccine on Monday for individuals older than sixteen years. Previously, the treatment was only administered under an emergency use authorization (EUA), which was granted in December 2020.](https://harkeraquila.com/wp-content/uploads/2020/12/vaccine-900x900.png)
3 COVID-19 vaccines move forward after promising Phase 3 clinical trial data
by Mark Hu and Sabrina Zhu
• December 2, 2020
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