So a single shot is definitely not sufficient to stop the youngsters getting it. On the very day my 17 yr old received her text saying she was now eligible for her second shot, she also returned a positive lateral flow test. She had, at that point, the symptoms of a cold and I only tested her as a precaution - never expected it to be positive. Two subsequent lateral flows she did (one the same evening and one the following morning) were both negative - but her PCR results have just come through and they’re positive. It will be interesting to see if I manage to avoid getting it again, as I spent Monday afternoon sitting alongside her in the car while she spluttered away from her “cold”.