The vaccine trials were trialed on a 2 injections spaced apart over a few weeks. Itt's common for some side effects to occur from some doses of the vaccine especially after second dose of vaccine.
My worry is if someone contracts the virus after receiving one dose of the vaccine and what would happen. If a serious illness occurs.
I was also watching TV earlier in the week and someone on a show was saying the UK is at 24% vaccinated. I felt watching it that it wasn't true. There's 24% partially vaccinated.