Immunisation principles and national schedule comparison — branching viva

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Stem

The examiner moves from definitions to an infant multi-antigen visit, then to measles coverage and regional schedules. [4] [1]

Branch 1 — Definitions

Examiner: What is the difference between vaccination and immunisation? [4]

Strong answer: Vaccination is giving the vaccine. Immunisation is the protected state after a successful response. Passive antibody can immunise temporarily without active vaccination. [4]

Examiner: What is herd immunity? [1]

Strong answer: Population transmission control when enough people are immune. Not a single child's titre. Thresholds differ by pathogen; measles needs very high coverage. [1] [3]

Branch 2 — Platforms

Examiner: Why not use plain polysaccharide vaccines as the infant standard for pneumococcus? [1] />

Strong answer: Infants respond poorly to T-independent polysaccharides and form weak memory. Protein conjugates recruit T-cell help and are the programme standard. [1] /> [1] />

Branch 3 — Validity and simultaneous dosing

Examiner: A dose was given a week too early. Counts? [1] />

Strong answer: Often invalid. Do not count toward completion. Plan a valid repeat after minimum age/interval rules. [4] [1] />

Examiner: Family wants four separate visits for four due antigens. [4]

Strong answer: Prefer same-day administration when rules allow to prevent missed opportunities. [4] [1] />

Examiner: Two injectable live vaccines five days apart? [4]

Strong answer: If not given same day, observe recommended spacing rather than a few days apart. [4]

Branch 4 — Neonatal and maternal

Examiner: Mother has hepatitis B; baby just born. [1] />

Strong answer: Time-critical birth-dose prevention pathway; do not wait for the routine six-week visit alone. [1] />

Examiner: Why ask about antenatal pertussis vaccine? [1] />

Strong answer: Maternal vaccination protects young infants before their primary series is complete. [1] /> [1] />

Branch 5 — Systems and regions

Examiner: Register says overdue; card looks complete. [1] />

Strong answer: Reconcile reporting failure versus true gaps before labelling the family. [1] /> [1] />

Examiner: How do you compare ANZ, UK and US schedules without guessing brands? [1] />

Strong answer: Shared science—conjugates, validity rules, measles two-dose logic, same-day dosing. Different programme shells—funding, exact ages, school delivery, product combinations. Name the jurisdiction; cite the current schedule source. [1] /> [1] /> [1] />

Examiner extras

• Cold-chain breach: quarantine stock and follow public-health advice. [1] />
• Mild illness is not an automatic full deferral. [4]
• Catch-up tables, AEFI detail and hesitancy OSCE belong on sibling topics.