The Centers for Disease Control and Prevention (CDC) has health warning levels for travelers.
Level
Key Message
Hazard
Color Code
1
Practice Usual Precautions
Manageable if appropriate steps taken.
green
2
Practice Enhanced Precautions
High if additional precautions not taken or if in a high risk group.
yellow
3
Avoid nonessential travel
Extremely high with little or no protection.
red
where:
• A level 0 might be used if no precautions are required.
Travel Guidance
Monitor conditions and adhere to recommendations.
Consider delaying or postponing trip.
Do not travel if at all possible.
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Specialty: Infectious Diseases
