Community Health and Public Health Nursing
What this domain tests
Community Health and Public Health Nursing tests levels of prevention, epidemiology, screening, immunization, outbreak response, and care of populations rather than individuals.
Core rules
- Primary prevention prevents disease before it occurs: immunization, seat belts, fluoride, health education. Secondary prevention detects disease early: screening and case finding. Tertiary prevention limits disability: rehabilitation and support groups.
- Incidence counts new cases over a period; prevalence counts all existing cases. Prevalence rises when survival improves even if incidence is unchanged.
- Attack rate equals new cases among exposed divided by total exposed, times 100.
- Outbreak investigation: confirm the diagnosis, define and count cases, describe by person, place, and time, form a hypothesis, test it, and implement control.
- Cold chain: keep vaccines at 2-8 C, monitor with a data logger, and discard according to protocol after a break.
- Screen only when the condition is important, detectable early, treatable, and the test is acceptable and affordable.
Worked example
In a school of 500 students, 40 develop gastroenteritis after a lunch; 200 ate the lunch. What is the attack rate among those exposed? Reasoning: attack rate = 40 / 200 x 100 = 20%. To compare with unexposed students, calculate the same rate for those who did not eat the lunch; a much higher rate among the exposed supports the food as the vehicle.
Traps
- Labeling a mammogram or Pap test as primary prevention; it is secondary.
- Confusing incidence and prevalence in a question about burden of chronic disease.
- Assuming association from a cross-sectional survey proves causation.
- Ignoring vaccine storage temperature while focusing on injection technique.