https://www.stltoday.com/lifestyles/health-med-fit/major-tes…
Its an improved vaccine.
“Pfizer and French biotech Valneva are aiming to avoid previous pitfalls in developing a new vaccine to protect both adults and kids as young as 5 from the most common Lyme strains on two continents.”
“a previous Lyme vaccine that GlaxoSmithKline pulled off the market in 2002 amid controversy and low sales. With about 75% effectiveness, that old Lyme shot got a lukewarm endorsement from vaccine experts, wasn’t tested in children and drew unsubstantiated reports of joint-related side effects.”