A lot of people take flu shots. Every year, there is an increasing push for people to get flu shots. The elderly are especially prone to get them, thinking they will be protected. But some still manage to get the flu anyways. You might know some people whom this has happened to.
Vaccines can have "vaccine derived virus interference". This means a vaccine can interfere with other viruses. According to one study published in January 2020, the flu shot has vaccine derived virus interference with "coronavirus and human metapneumovirus". The abstract conclusion states:
Vaccine derived virus interference was significantly associated with coronavirus and human metapneumovirus
To make it clear again, the study concludes in the Discussion of the paper:
Additionally, the laboratory data in our study showed increased odds of coronavirus and human metapneumovirus in individuals receiving influenza vaccination.
You have increased odds of being infected with the coronavirus after you receive a flu vaccine.
Now, you might go google this and find some alleged super-duper high-quality "Fact checker" sites or articles say this is false. One is from USA Today.
The claim: The flu vaccine can cause people to test positive for coronavirus
Our ruling: False
There is no known connection between the flu vaccine and the novel coronavirus.
Did you notice how they specifically mention "novel coronavirus"? That's important. This is an obfuscation. It's an attempt to say that the study wasn't specifically for SARS-COV-2, therefore it's "false". But the study did show it for coronavirus. Last time I checked, SARS-COV-2 is the Sudden Acute Respiratory Syndrome Coronavirus 2. That's a coronavirus. The study wasn't looking at SARS-COV, or MERS, but simply the coronavirus family.
This spin hit-job by the so-called "fact checkers" tried to whitewash the conclusions by using clever rhetoric to fool the reader. "Oh no, this study didn't show a connection between the flu vaccine and novel coronavirus, i.e. COVID-19. Nice try.
Another recent study published in March 2020, Association between Influenza Vaccination Rates and SARS-CoV-2 Outbreak Infection Rates in OECD Countries, confirmed the previous study.
Here we show that reported influenza vaccination coverage rates for 29 OECD countries are associated significantly with recently observed SARS-CoV-2 infection rates in these countries. This early result, which merits further investigation, suggests that during the current coronavirus outbreak an influenza vaccination background might be a relevant factor for SARS-CoV-2 infection.
Again, those who get the flu vaccine show significant rates of SARS-COV-2 infections.
Judge for yourself. I don't trust any of the so-called "fact checker" sites. From what I've seen, when looking at any information that isn't part of the mainstream narrative, they try their hardest to conclude it's "false". Just like USA Today did.