The COVID-19 (coronavirus) pandemic resulted in vaccines, and many people advertised their vaccinations on social media. A joke about this is:
   
“How do you know if someone is vaccinated?”
“Don’t worry, they’ll tell you.”
   
“How do you know if someone got vaccinated? Don’t worry they’ll tell you” was posted on Twitter by Jonathan Rodgers on December 23, 2020. “How do you know if someone is vaccinated for COVID? Don’t worry, they’ll tell you within the first 2 minutes of meeting them” was posted on Twitter by Howard Farran on December 30, 2020.
   
“How do you know if someone is a vegan?”/“Don’t worry, they’ll tell you” is an original version of this snowclone.
   
   
Wikipedia: COVID-19 pandemic
The COVID-19 pandemic, also known as the coronavirus pandemic, is an ongoing pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), first identified in December 2019 in Wuhan, China. The outbreak was declared a Public Health Emergency of International Concern in January 2020 and a pandemic in March 2020.
                       
Twitter
Jonathan Rodgers
@JK_Rodgers
How do you know if someone got vaccinated? Don’t worry they’ll tell you.
12:00 PM · Dec 23, 2020·Twitter for Android
 
Twitter
Howard Farran
@HowardFarran
How do you know if someone is vaccinated for COVID?
Don’t worry, they’ll tell you within the first 2 minutes of meeting them.
9:58 PM · Dec 30, 2020·Twitter for iPhone
 
Twitter
Dylan Jordan
@trannyfrmdablok
Dw you’ll know if your around someone’s who’s vaccinated bc they’ll tell you
12:05 PM · Jan 9, 2021·Twitter for iPhone
 
Twitter
madhooligan
@dmadhooligan
Replying to @RealMattCouch
How do you know someone got vaccinated? Give it 30 seconds, they’ll tell you.
5:53 AM · Feb 15, 2021·Twitter for iPhone
 
Twitter
Brett Saxon
@BrettSaxon
You know how to tell if someone has been vaccinated or not?            They’ll tell you.
9:32 AM · Feb 18, 2021·Twitter for iPhone
 
Twitter
buckzollo
@buckzollo
How do you know if someone is twice vaccinated? Oh don’t worry, they’ll tell you. Hi.
3:12 PM · Feb 28, 2021 from Los Angeles, CA·Twitter for iPhone
 
Twitter
Business Cat
@DinosDie
The vaccinated are the new vegans. How do you know someone has been vaccinated? Don’t worry they’ll tell you.
11:37 AM · Mar 24, 2021·Twitter for iPhone
 
Twitter
Vivek
@VlVEK
Q: How would you know that someone has been vaccinated for covid?
A: They’ll tell you
8:07 AM · Apr 3, 2021·Twitter for iPhone
 
Twitter
Will Ferrell
@Will___Ferrell
How do you know if someone is vaccinated?
Don’t worry they’ll tell you.
4:38 PM · Apr 28, 2021·Twitter for Android
 
Twitter
Juanita Broaddrick
@atensnut
My Friend:  “How do you know if someone has been vaccinated?”
Me:  “Don’t worry….... they’ll tell you.”
8:07 PM · May 4, 2021·Twitter for iPhone
 
Facebook
Maz Barlow
May 10, 2021 at 4:41 PM ·
(This is shown on a meme.—ed.)
How do you know if someone is vaccinated?
Don’t worry, they’ll tell you.