So those with antibodies still have an active Covid that can be transferred?
Isn't it the function of a vaccine to produce those antibodies? Is it just the coronavirus that doesn't respond to building antibodies through vaccines that would stop the spreading, as a polio or measles vaccine, or small pox vaccine does? (different viruses?)
Most likely, although we don't know if these people just didn't mount much of an immune response so don't have many antibodies. This data doesn't show if vaccinated people are transmitting the virus to others, other I would say that's also likely and earlier there was a study discussed about viral loads in people who were vaccinated.
Yes, the point of vaccines is to get the adaptive immune system to recognize the virus and antibodies are a big part of that. People who are vaccinated are contracting COVID and lower rates and of those who do contract it, the rates of hospitalizations, ICU admissions and deaths are all lower. Also, the major strain going around in Alberta is the delta variant, so that affects things too, although the vaccine is still effective against it but it spreads better than the initial virus, both in the vaccinated and in the unvaccinated.
Having antibodies doesn't always stop an infection from beginning. I do recall seeing something too that it's common for respiratory illnesses to not be prevented as well from vaccinations compared to other types of infections.
I think the big message that public health groups need to send out is the vaccine is very beneficial when it comes to preventing serious illness, especially for people with healthy immune systems. It also lowers the risk of infection, but vaccinated people still do get COVID, and it's not rare (currently in Alberta there are about 3000 vaccinated people who have it). *We don't know how well vaccinated people transmit the virus. Vaccinated people need to take care about the possibility of transmitting it to those who are vulnerable.
*There's certainly more information out there, I don't think there's a good conclusive statement on that yet. I would like to see a study about positive vaccinated people and rates of transmission in households, daycares etc. and looks to see how many ended up contracting it If there is good information where public health groups could alter that statement I think that really needs to be said and more publicized.