roubaixtuesday
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I'm a bit confused with these messages about the jab giving immunity. I thought it didn't stop you catching it, or spreading it, it just hopefully made the symptoms less severe if you caught it.
These things aren't black and white. Once vaccinated, if you're exposed:
(1) you might defeat the virus so quickly it doesn't even enter a single cell in your body and replicate. Unlikely.
(2) You might defeat the virus after it replicates in a small number of cells, such that you would never test positive, and never infect anyone.
(3) You might defeat the virus before it replicates enough to give you symptoms, your viral load is enough to test positive, but you are barely if at all infectious to others.
(4) You might defeat the virus before it replicates enough to give you symptoms, but your viral load is enough to test positive, and you are infectious to others
(5) you might defeat the virus after you get symptoms, but before getting severe disease
(6) despite your vaccination, you still get severe disease, or die.
The primary end point of the trials being reported are symptomatic disease - whether it halts progression at or before step 4, and that's what is quoted as efficacy. 90% effective = 90% of infections never progress beyond step 4.
It's generally thought likely that as the results are so good (far better than hoped for), then it's likely transmission will be curtailed to some degree, maybe very significantly. But nobody knows for sure.