- The UK no longer holds WHO measles elimination status, following sustained transmission (UKHSA).
- Employers of patient-facing staff should be able to evidence MMR immunity across their workforce.
- Occupational health can confirm immunity, arrange catch-up vaccination and keep auditable records.
- Acting now lowers clinical risk and the disruption an outbreak would cause in your setting.
Measles is one of the most infectious diseases we know of, and for more than a decade the UK held World Health Organization elimination status – meaning it was no longer considered endemic. That status has now been lost. For employers, and particularly those with patient-facing or clinically exposed staff, this shifts proven immunity from a nice-to-have to something you should be able to demonstrate.
This piece sets out what has changed, why it matters for you as an employer rather than as a clinician, and a short checklist you can work through with your occupational health provider.
What has actually changed
Elimination status is a public-health measure, not a clinical one. The WHO withdraws it when a country records continuous transmission of the same strain over an extended period. Losing it does not mean measles is suddenly widespread everywhere – it means the conditions now exist for outbreaks to take hold, especially where pockets of the population are not immune.
For most office-based workforces the day-to-day risk is low. The picture is different in healthcare, education and other settings where staff come into close contact with vulnerable people, unimmunised children or the public in large numbers.
Immunity you cannot evidence is immunity you cannot rely on when an outbreak reaches your door.
Why it matters for employers
If you employ patient-facing staff, you are expected to know – and be able to show – that your workforce is protected. That expectation sits alongside your wider duty to protect employees and the people they work with. In practice, the questions an auditor or infection-control lead will ask are simple: which of your people are exposed, and what evidence do you hold that they are immune?
Where that evidence is missing or held inconsistently, the gap only becomes visible during an incident – which is the worst possible moment to discover it.
Good practice
Treat immunity records as part of routine pre-placement checks for new starters, not as a one-off audit you run after a scare.
Medwyn tip
Where records are missing, a blood test for measles IgG can confirm existing immunity and avoid unnecessary revaccination.
What good practice looks like
A defensible approach has three parts: knowing which roles are exposed, holding evidence of immunity for those roles, and having a clear route to close any gaps through catch-up vaccination. None of this needs to be onerous – but it does need to be consistent and auditable.
Two documented MMR doses, or a positive antibody result, is the standard evidence of protection. The aim is a single, reliable record you can produce on request, rather than immunity scattered across GP letters, memories and assumptions.
A practical checklist for employers
- Identify which of your roles are patient-facing or clinically exposed.
- Confirm whether you hold evidence of two MMR doses or positive antibody status for those staff.
- Check how new starters' immunity is verified at pre-placement.
- Set out how you will offer catch-up vaccination to any non-immune staff.
- Confirm where immunity records are stored, and who is able to audit them.
How Medwyn can help
Our occupational health team – qualified, accredited clinicians – can review immunity across your workforce, run catch-up clinics on-site or in our Surrey clinic, and give you a single auditable record for each exposed role. Where you are starting from incomplete information, we can confirm immunity by antibody testing and vaccinate only where it is genuinely needed.
This article is general guidance for employers and is not individual medical or legal advice. If you are unsure how it applies to your organisation, contact our team.