Two decades of federal surveillance data reveal how immune imprinting and an aging immune system undermine flu vaccine effectiveness. Current universal vaccination policy has not caught up to the biology.
Every autumn, public health authorities deliver a message that is simultaneously accurate and misleading: get your flu shot. All Americans aged six months and older are recommended to receive one. The guidance is consistent, reassuring, and considerably more complicated than it sounds.
A synthesis of two decades of CDC surveillance data, which will be published separately in Malone.News makes an argument that has been quietly building in the immunology literature for years: the current one-size-fits-all approach to seasonal influenza vaccination fails to account for two fundamental features of how the immune system actually works. The first is that your first flu exposure as a child permanently shapes how you respond to every flu vaccine you will ever receive. The second is that the immune system ages in ways that make older adults both the most important target for vaccination and the least reliable responders to it.
This is not a case against flu vaccination. It is a case for being honest about what the vaccine does and does not do, and for whom. In other words, it is a case for open and transparent informed consent.