CDC travel notice levels 1–4

Level 1 usual precautions, 2 enhanced precautions, 3 reconsider nonessential travel, 4 avoid nonessential travel.

Level 1 — Practice usual precautions.
Level 2 — Practice enhanced precautions.
Level 3 — Reconsider nonessential travel.
Level 4 — Avoid nonessential travel.

These are the CDC's own levels. Some notices cover one area (for example an Ebola outbreak in specific provinces); others are global and list many countries (for example Global Measles). OutbreakWatch shows the notice title, level and date, and links to the full CDC page.

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