Weak immune system and COVID-19 vaccine - additional dose recommended. For further information click here.

Weak immune system and COVID-19 vaccine

Weak immune system and COVID-19 vaccine - additional dose recommended

As part of the ongoing National Vaccination program, individuals with a weak immune system (immunocompromised/Immunosuppressed) are deemed as a priority group for an additional vaccination dose. If you had a weak immune system at the time of your initial course of COVID-19 vaccination, you may be offered another COVID-19 vaccine dose to give you better protection.

  • Hospital Consultants will identify the patients who need an additional dose. Each hospital is linked to a primary Vaccination Centre (e.g. Mater Private Dublin is linked to Swords Vaccination Centre). These centres liaise with the relevant community vaccination centres (CVCs). You do not need to register or contact anyone. Patients who need an additional dose will receive a text message from their  HSE Community Vaccination Centre (CVC) with an appointment for their vaccine.

  • These additional doses will be given through the HSE community vaccination centre near you. GPs may also vaccinate some patients.  


  • Regardless of which COVID-19 vaccine course you had previously, you will be offered a single dose of either the:

    • Pfizer/BioNTech COVID-19 vaccine
    • Moderna COVID-19 vaccine

    An additional adenoviral vector vaccine (Vaxzevria® (Astrazeneca) or COVID-19 Vaccine Janssen®) can be considered for those with a contraindication or precaution to an mRNA vaccine.

  • It is safe to get your COVID-19 vaccine at the time as the flu vaccine or other vaccines you may need.

Which category of patients are prioritised?

Patients with the following conditions or treatments should get an additional dose. There are specific criteria associated with each condition so please see the relevant information in the table below.

Reference: https://www.hse.ie/eng/health/immunisation/hcpinfo/guidelines/covid19.pdf 

Medical conditionCriteria

Receiving or within 6 weeks of receiving systemic cytotoxic chemotherapy, targeted therapy, monoclonal antibodies or immunotherapies

Receiving treatment or pending treatment for a haematological cancer

Undergoing or within 6 weeks of surgery or radical radiotherapy for lung or head and neck cancer

Advanced/ metastatic cancer

Haematological - within 5 years of treatment

Non-haematological cancer within 1 year following immunomodulating treatment

All other cancers being treated (excluding hormonal treatment)

Chronic kidney disease

On dialysis, or eGFR <15 ml/min

eGFR <30ml/min

Immunocompromise due to disease or treatment


e.g. Transplantation:

- Listed for solid organ or haematopoietic stem cell transplant (HSCT)

- Post solid organ transplant at any time

- Post HSCT within 12 months

Genetic diseases:


- Inborn errors in the interferon pathway


- including but not limited to Cyclophosphamide, Rituximab, Alemtuzumab, Cladribine or Ocrelizumab in the last 6 months


e.g. High dose systemic steroids

HIV, not on treatment or CD4 count <200 x10-6L for adults

Further Information

For additional information in relation to your vaccine appointment please visit the HSE website

If you are a patient of one of the Consultants working at Mater Private Network and have a query in relation to your upcoming appointment for the additional vaccine dose, please send an email to vaccinebooster@materprivate.ie.