The vaccines do give you antibodies.

https://www.contagionlive.com/view/moderna-covid-19-vaccine-maintains-elevated-antibodies-over-time

In a Letter to the Editor published today in the New England Journal of Medicine, investigators studying the Moderna COVID-19 vaccine, mRNA-1273, said virus neutralizing antibodies remained elevated in all the participants 3 months after the booster vaccination.
The vaccine, administered at the 100-μg dosage, was shown to produce high levels of binding and neutralizing antibodies that declined slightly over time.

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John