COVID-19 vaccines have officially arrived in London, with doses starting to get into the arms of children between the ages of five and 11 starting Friday.It was just last Friday that the pediatric Pfizer vaccine was approved by Health Canada for kids aged five to 11, and this Tuesday that appointments were opened up for that age group.The dose for those aged five to 11 has a lower concentration of antigen, the part of the vaccine that increases the development of antibodies.Since appointments were opened, the acting medical officer of health for the Middlesex London Health Unit reports more than 8,000 have been booked.“This represents over 22 per cent of the population five to 11 in our region,” Dr.