Recommended timing gaps for different COVID-19 vaccines

The interval gap (or ‘dosing interval’) is the minimum time between COVID-19 vaccines. Times vary depending on how many COVID-19 vaccinations you’ve already had, what vaccine type you’re getting, and if you’ve recently had COVID-19. Some vaccine combinations may also require a prescription. The interval gap is to ensure vaccine effectiveness and safety.

Last updated: 27 September 2022

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First dose and second dose minimum gap 

First dose 

Second dose 

Minimum gap 

Age

Pfizer 

Pfizer 

3 weeks 

12 and over

Pfizer paediatric (child)  

Pfizer paediatric (child) 

8 weeks 
* this gap can be shortened to 3 weeks in limited circumstances, such as prior to the initiation of significant immunosuppression or international travel 

5 to 11
Pfizer paediatric (child)   Pfizer (adult) 8 weeks 
* this gap can be shortened to 3 weeks in limited circumstances, such as prior to the initiation of significant immunosuppression or international travel 
11 to 12
Pfizer paediatric (child)   Novavax 

8 weeks
Prescription needed 

11 to 12

Novavax 

Novavax 

3 weeks 

12 and over

Pfizer 

Novavax 

4 weeks 
Prescription needed 

18 and over

All other combinations

4 weeks 
Prescription may be needed – discuss with your GP or healthcare provider 


Second dose and first booster minimum gap 

*These interval times are the same if you’ve had a third primary dose and you’re getting a first booster.

Second dose  

First  
booster 

Minimum gap

Age/eligibility

Pfizer 

Pfizer   

3 months

18 and over

Pfizer  

Pfizer  

6 months

16 or 17

Pfizer  

Novavax

6 months

18 and over

Novavax  

Novavax

6 months

18 and over

Novavax

Pfizer

6 months

18 and over

All other combinations

Prescription might be needed – discuss with your GP or healthcare provider


First and second booster minimum gap   

First booster

Second booster  

Minimum gap

Age/eligibility

Pfizer

Pfizer

6 months

16 and over  
See if you are eligible

Novavax

Novavax

6 months

18 and over
See if you are eligible

All other combinations   

6 months
Prescription might be needed – discuss with your GP or healthcare provider  


Second dose and third primary dose minimum gap 

(Severely immunocompromised people only) 

Second dose 

Third primary dose 

Minimum gap 

Age

Pfizer 

Pfizer 

At least 8 weeks 
Prescription needed – discuss with your GP or healthcare provider 

5 and over

All other combinations 

Prescription needed – discuss with your GP or healthcare provider 


How to get a prescription 

If you need a prescription, prior to your appointment at the vaccination clinic, visit your preferred GP to discuss your options. Appointments to discuss COVID-19 vaccine options and obtain a prescription are free. 

It's also possible to get a prescription at a vaccinating Novavax clinic when you arrive for your appointment – first, you’ll need to talk with the vaccination site’s clinical lead.  

Severely immunocompromised people who wish to receive a third primary dose will need to get a prescription from their usual healthcare provider. We recommend you schedule a free appointment with your usual healthcare provider. 

COVID-19 vaccine: Severely immunocompromised people 


Non-COVID-19 vaccines 

If you’re having a Zostavax shingles vaccine, a 7-day gap before or after a COVID-19 vaccine is recommended.  

For Novavax, a 3-day gap is needed for if you’re having a Shingrix shingles vaccine, or the Fluad Quad flu vaccine. 

All other vaccines may be administered before, after, or at the same time as any other COVID-19 vaccines. 

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