Prisons stand a better chance of containment than most institutions
How so? People enter and leave prisons all the time. Once an inmate has the virus, it is very very difficult then to stop it spreading amongst the other inmates.
I’m just thinking that they’re never going to be very effective as this virus seems to be incredibly contagious so if you’re exposed to it, you’re going to get it
Yes, this is true. That’s why the lockdown measures have been introduced... to prevent as many people as possible from being exposed to it all at the same time. It isn’t to lessen the number of cases overall, it’s to slow down the spread of cases so that the hospitals aren’t inundated.