Doesn't reduce the spread of the variants actually in circulation at all after just a few months after your last booster. https://assets.publishing.service.gov

Doesn't reduce the spread of the variants actually in circulation at all after just a few months after your last booster. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1109618/vaccine-surveillance-report-week-40.pdf https://assets.publishing.service.gov.uk/government/uploads/... Table 4a. They remain quite effective against hospitalisation and death, and have saved millions of lives globally, net. Old people should get vaccinated but the herd immunity arguments used to justify vaccination of young people are completely unjustified.