Public Health and Preventive Care
This domain tests prevention at population scale: screening principles, immunisation practice, notification of communicable disease and travel medicine. Questions often ask whether an intervention is primary or secondary prevention, or whether screening is justified at all.
Core rules
- Levels of prevention: primordial (remove risk in the population), primary (prevent onset - immunisation, smoking cessation), secondary (early detection - mammography, cervical cytology), tertiary (limit disability - cardiac rehabilitation), quaternary (avoid overmedicalisation).
- Screening criteria: important condition, accepted treatment, valid and acceptable test, cost-effective, continuous case-finding, and management of those found positive must be available.
- Immunisation practice: follow the Omani national schedule; live vaccines are avoided in pregnancy and significant immunosuppression; check the cold chain; keep anaphylaxis treatment available; report adverse events after immunisation.
- Notifiable diseases: notify the Ministry of Health immediately using the national list - measles, tuberculosis, meningococcal disease, cholera, polio, food poisoning, dengue and malaria among others. Notification is a legal duty and does not require patient consent.
- Tuberculosis: case-finding, directly observed therapy and contact tracing; treat latent infection in high-risk contacts.
- Travel: destination-specific malaria chemoprophylaxis, yellow fever certificate where required, and meningococcal ACWY vaccination for Hajj and Umrah pilgrims.
- Antimicrobial stewardship: prescribe only when indicated and use the narrowest effective agent.
Worked example
A school reports two measles cases. Reasoning: this is an outbreak, so notify immediately, isolate cases, list contacts, check vaccination status, offer MMR to susceptible contacts within 72 hours and immunoglobulin to vulnerable contacts, and monitor for 21 days.
Traps that cost marks
Calling mammography primary prevention; assuming screening is always beneficial despite lead-time and overdiagnosis; giving live vaccine in pregnancy; delaying notification until confirmation.