Erie County politician Mark Poloncarz announced Tuesday he wants to make it a rule at Bills and Sabres contests in 2021 that in order to attend games in person, ya gotta show proof of a COVID vax.

In his announcement, Poloncarz made it clear it's "the only safe way to have a full house" at the stadiums ... adding, "No Vaccine = No Entry."

Bush -- someone who's made it clear she's NOT getting the vaccine -- went ballistic over the idea ... going as far as to call Poloncarz a "moron" for wanting to implement the county rule.

"If Erie county wants to pull this bull s*** watch and see what happens," Bush said.

She added, "[Poloncarz] does know that you can still contract covid once vaccinated and pass it to others still too right? Buffalo you better speak up before you lose a whole lot."

Bush -- a regular at Bills games prior to the pandemic -- wasn't done there ... she fired off several more tweets defending her position, writing, "I would compare covid to the flu rather than a cold but couldn’t pay me to get the vaccine, especially after having it."

"It was bad. But not bad enough to turn myself into a lab rat for an experimental vaccine."

Bush continued, "So now my daughter is missing ANOTHER year of watching her dad play live in a very short lived career. Not even an option available to her since we already know kids can’t get the covid vaccine. How is that fair or acceptable. It’s not. FL and TX would never."

For the Bills' part, the team said in a statement it will follow Poloncarz's orders if still in place for the season ... explaining, "As we did last year, we will continue to cooperate and comply with all New York state and local government regulations regarding our sporting events."

The Bills are expected to open their season in September.

FYI, the CDC fully supports COVID vaccinations -- explaining on its website, "COVID-19 vaccination works by teaching your immune system how to recognize and fight the virus that causes COVID-19, and this protects you from getting sick with COVID-19."

"Being protected from getting sick is important because even though many people with COVID-19 have only a mild illness, others may get a severe illness, have long-term health effects, or even die."

"There is no way to know how COVID-19 will affect you, even if you don’t have an increased risk of developing severe complications."

As we previously reported, Russell Wilson and Ciara will be hosting an NBC special this weekend aimed at educating people about COVID vaccinations and debunking unsubstantiated claims.