A friend of mine caught covid before full immunity had built from the vaccine. She's OK now, but wasn't feeling at all well. How many others have had this happen, and how ill have people been if they've caught covid really soon after the vaccine? I know there tends to be a spike in covid deaths just after countries introduce the vaccine, presumably because people stop being so careful when they've had the jab, so they go out and catch covid. What are people's experiences of this?