Mixing the brands is a good idea IMO. The mRNA used is different, so they encode different parts of the virus that your cells can recognize, meaning your body will potentially recognize a wider variety of COVID strains.

The main thing to watch out for is that the effectiveness of these vaccines wears off after about 4 months, so you should get a booster more frequently than is recommended.

You should have gotten pfizer the first time as Moderna has been discovered to have adverse interactions with hormonal birth control, but this is perfectly safe. Everyone I know in Canada who's been boosted mixed mRNA brands.

It's fine. I've seen some mumblings moderna is a little more effective but honestly all the vaccines look about as good as each other.

Obligatory reminder that getting vaccinated is absolutely 100% something everyone should do, but they do not guarantee prevention from infection or long covid so please also wear a well-fitting respirator as much as you can in daily life.

No, because then the juice that turns you gay in Moderna conflicts with the chemical that turns you gay in the Pfizer and you're back to being straight.

But as far as protection from covid goes it doesn't matter that much.

Last time I checked Moderna is a bigger dose, and people tend to have a stronger reaction to it, but they are essentially the same.

I've had both. Got the 2024 booster yesterday and they only had Pfizer. TBH, the reaction has been milder than the Moderna last year. Also got the flu shot at the same time last year and this time, so I figure that cancels out.

FWIW, have been told multiple times by pharmacists and doctors that mixing is OK.