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The COVID-19 vaccines were developed quickly without compromising safety.
Here’s how! A short thread. #ScienceUpFirst
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![The COVID-19 vaccines were developed quickly without compromising safety.Here’s how! A short thread. #ScienceUpFirst [1/6]](https://pbs.twimg.com/media/Es1No48U0AAWplk.jpg "The COVID-19 vaccines were developed quickly without compromising safety.Here’s how! A short thread. #ScienceUpFirst [1/6]")
Here’s how! A short thread. #ScienceUpFirst
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Researchers didn’t create the vaccines from scratch! They’ve been studying related coronaviruses for YEARS.
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![Researchers didn’t create the vaccines from scratch! They’ve been studying related coronaviruses for YEARS.[2/6]](https://pbs.twimg.com/media/Es1Ny6SWMAQ0KtO.jpg "Researchers didn’t create the vaccines from scratch! They’ve been studying related coronaviruses for YEARS.[2/6]")
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RNA-based therapies (like Moderna and Pfizer/BioNTech vaccines) have been studied for 3 decades and in clinical trials for >5 years!
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![RNA-based therapies (like Moderna and Pfizer/BioNTech vaccines) have been studied for 3 decades and in clinical trials for >5 years![3/6]](https://pbs.twimg.com/media/Es1N7fjVcAAG3gf.jpg "RNA-based therapies (like Moderna and Pfizer/BioNTech vaccines) have been studied for 3 decades and in clinical trials for >5 years![3/6]")
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The timeline was sped up 
by doing steps in parallel instead of sequentially, plus tremendous global collaboration and sharing of resources 
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![The timeline was sped up by doing steps in parallel instead of sequentially, plus tremendous global collaboration and sharing of resources [4/6]](https://pbs.twimg.com/media/Es1QaJKXAAIPPtC.jpg "The timeline was sped up by doing steps in parallel instead of sequentially, plus tremendous global collaboration and sharing of resources [4/6]")
by doing steps in parallel instead of sequentially, plus tremendous global collaboration and sharing of resources [4/6]
Serious adverse events from vaccines are less common than getting hit by lightning (~1-2 in a million for flu vaccine).[5/6]
![Serious adverse events from vaccines are less common than getting hit by lightning (~1-2 in a million for flu vaccine).[5/6]](https://pbs.twimg.com/media/Es1PtBiWMAENdej.jpg "Serious adverse events from vaccines are less common than getting hit by lightning (~1-2 in a million for flu vaccine).[5/6]")
Serious adverse events usually happen within hours to at most a few months following vaccination, so any major issues would've shown up by now since trials started in March 2020.
[6/6] #ScienceUpFirst
[6/6] #ScienceUpFirst
