Jeffreyn, I don't live with PD but know a fair bit of immunology and cell biology.

Like you, I have not had flu for many years. The current flu vaccines are essentially an exercise in "catch-up". Flu virus, because it is an RNA virus, mutates rapidly so the vaccines are an attempt to block infection by the latest version(s).

This topic came up recently in a regular consultation with my GP. He suggested that I might like to get the current flu vaccine. I pointed out that I have no underlying medical problems which mean that I am unusually susceptible to flu virus infection and its possible consequences. He agreed with my call not to get the vaccine.

Other folk, with different medical histories, may make other choices.