CDC TravelCDC has a 3-level warning system.
1. Watch Level 1: Practice Usual Precautions
2. Alert Level 2: Practice Enhanced Precautions
3. Warning Level 3: Avoid Non-essential Travel
Once you click on the alert for the country in which you travel, it will open another page with all kinds of information ranging from what is the threat to what can travelers do to avoid the situation.