From what I understood one can still catch and spread covid with the vaccine, it just insures a less bad case of it.
Once vaccinated, you don't catch it. But you can still spread it around. That's why you still have to wear a mask and keep distance.
I hope you realize that it doesn't make sense as written. Maybe you meant to write "once vaccinated, you don't get sick, but you can still catch it and spread it (asymptomatic infection?)".
According to Pfizer's clinical trial, several of those who were vaccinated
did get come down with covid. Of the 325 subjects who developed covid, 275 had been given a placebo, and 50 had been vaccinated. Of those 50, most had gotten sick during the week or two after getting the injection, so masks would definitely be warranted at that time.
But even after the second injection, a few people developed covid: 172 in the placebo and 9 in the vaccinated group. So the vaccine
decreases the risk of getting sick, but doesn't eliminate it entirely.
Nobody knows why those specific individuals got covid after vaccination, so everyone who's vaccinated is advised to maintain masking and distancing to keep their risk low. Many of those being vaccinated first are davka those who are most vulnerable, so it's important that they realize that they're not 100% immune.
Can those who were vaccinated still carry virus in their nasal passages/mouth/lungs and expel it, thereby transmitting the disease to others? Nobody has the answer to that yet (though it's being studied), so that's a second reason to continue masking and distancing.
Discussed earlier:
https://forums.dansdeals.com/index.php?topic=121947.msg2371751#msg2371751https://forums.dansdeals.com/index.php?topic=121947.msg2372294#msg2372294