I had my 3 jabs done when I was a newborn, but when i did my blood test it showed my antibodies were "non reactive " and was advised to redo all 3 jabs.

When i asked the doctor he said the immunity "may wear off in some people"

He also said each jab should be done as close as possible to the same date, e.g 20/1, 20/2, 20/8. If miss by around 1 week then the vaccine wont be effective...

Got such things?