They aren't specifically designed to prevent transmission, but that doesn't automatically mean they won't. I've read it's just not known yet how it will work; you might be vaccinated, pick up the virus and it takes your immune system a day or two to kill it off and you might still be able to pass it on to others for just those couple of days.
But it's not like it won't slow the spread. On average it take 5-7 days to develop symptoms, sometimes as long as 14, and you're still spreading it before it becomes obvious that you have it! It WILL provide protection to others, we just don't know for sure exactly how much just yet. It's a new situation. ANY vaccine has the chance of lessening a sickness instead of 100% preventing it, depending on your immune system.
But if 70% become vaccinated, it will be enough to tamp down the pandemic. The whole idea of a vaccine is that it pre-engages your immune system so it doesn't have to build up its own response all by itself. And that makes you less dangerous to others once you're exposed, because you're fighting it off much more effectively.
But it's not like it won't slow the spread. On average it take 5-7 days to develop symptoms, sometimes as long as 14, and you're still spreading it before it becomes obvious that you have it! It WILL provide protection to others, we just don't know for sure exactly how much just yet. It's a new situation. ANY vaccine has the chance of lessening a sickness instead of 100% preventing it, depending on your immune system.
But if 70% become vaccinated, it will be enough to tamp down the pandemic. The whole idea of a vaccine is that it pre-engages your immune system so it doesn't have to build up its own response all by itself. And that makes you less dangerous to others once you're exposed, because you're fighting it off much more effectively.