"It's just this one" — the MMR conversation

PLAB 2 & PRES 3 · paediatrics / communication skills · medium · 10 minutes

Candidate brief

You are an FY2 doctor in a GP surgery. Mrs Sarah Whitfield has brought her son Leo, 14 months old, for a developmental review. Leo is thriving. His first MMR vaccination was due at 12 months and is now overdue — the practice has written twice. Mrs Whitfield says: "We're not anti-vaccine — he's had everything else. It's just this one. I've read so much about the MMR and autism, and I keep thinking… what if? My sister says give them separately. Can you do that here?" Please counsel her about the MMR vaccination.

What examiners look for

Vaccine hesitancy is a conversation, not a debate: the parent is not the enemy of the child in front of you — she is the child's fiercest protector working from corrupted data. The candidate who asks "what have you read?" before saying anything is halfway home, because the specific fear (autism? overload? a neighbour's story?) decides which evidence matters. Tell the Wakefield story as a story, not a slogan: twelve children, invented data, a lawyer's money, a struck-off author — against two Danish studies of over a million children. Parents who have only ever heard "debunked" have been given a conclusion; parents who hear the anatomy of the fraud have been given a tool they can use on the next scary reel themselves. Never say a vaccine is 100% safe. Say what its real risks are, with numbers, unprompted — fever in 1 in 10, febrile seizure in ~1 in 3,500, serious allergy in ~1 in a million — and then set measles' numbers beside them. Credibility is cumulative: every conceded small risk buys belief in the big reassurance. Name omission bias when it walks in: "If I vaccinate and something happens, I caused it; if he catches measles, that's fate" is the emotional engine of most hesitancy, and it is arithmetically backwards — declining is also an action, and it selects the far worse odds. Said gently, by a doctor she trusts, it is often the sentence that books the appointment. And close the loop in the room: an appointment made, side effects previewed (so the day-8 rash is expected, not incriminating), the second dose normalised, the conversation documented. Hesitancy is perishable — in both directions.

Guideline references

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