How dangerous is it?

Many people are infected and do not develop any symptoms, said Bob Eadie of the Monroe County Health Department. Others develop severe joint pain, which is why it is also sometimes known as “breakbone fever.” People with chronic conditions such as diabetes, hypertension or congestive heart failure may be at increased risk of severe disease. Fatalities are rare; less then 1 percent of patients succumb to the disease.

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1. What is dengue?
2. How dangerous is it?
3. How did it get to Key Largo?
4. Is it safe to travel to the Keys?