You should advise the person administering the COVID-19 vaccine if you have ever had an allergic reaction to either an earlier dose of the COVID-19 vaccine or any other vaccination. Some vaccines do contain other components to which some people can react. Some of the COVID-19 vaccines have specifically avoided having any of the common precipitants for these types of reaction. The person administering the vaccine will be able to advise on whether or not it will be safe to proceed with the particular vaccine being offered.