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Original poster

Third primary dose or booster, what's the difference?

6 replies

GranolaHolmes · 27/12/2021 09:30

When I took my son for his 3rd jab they said it was a third primary vaccine and to come back for a booster. He's CEV/immunosuppressed.

What's the difference and when does he have the booster then?

OP posts:
MerryChristmas21 · 27/12/2021 09:32

The vaccine type Pfizer/Moderna etc) they use & the quantity of vaccine used - which varies depending on the type.

Original poster
GranolaHolmes · 27/12/2021 09:41

Ah ok I've found it. So he has booster 3 months after the 3rd dose now. Sorry I can't keep up.

OP posts:
BeLessMe · 27/12/2021 09:51

Yes the difference is that immunosupressed get an extra dose, as they may not make a full immune response to the vaccine, so they get an extra top up.

Original poster
GranolaHolmes · 27/12/2021 10:28

Thank you

OP posts:
Cookerhood · 27/12/2021 11:59

If he has a third primary dose of Moderna or Pfizer it will be the full dose of either. If he has a booster of Moderna it will be half a dose, whereas Pfizer booster is a full dose.

Original poster
GranolaHolmes · 27/12/2021 12:06

He's had three Pfizers

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