Medicine — Levels of Prevention

Primary, secondary and tertiary prevention.

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digraph Prevention {
  node [shape=box, style=rounded];
  "Public health" -> "Primary (prevent onset)";
  "Public health" -> "Secondary (early detection)";
  "Public health" -> "Tertiary (manage disease)";
  "Primary (prevent onset)" -> "Vaccination, education";
  "Secondary (early detection)" -> "Screening";
}