1. The CDC is telling doctors to be alert for dengue cases.
[alert: adjective quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant. "an alert police officer discovered a truck full of explosives"
noun the state of being watchful for possible danger. "security forces were placed on alert"
verb warn (someone) of a danger, threat, or problem, typically with the intention of having it avoided or dealt with.
"he alerted people to the dangers of smoking"]
2. Cases of the tropical disease have been breaking international records.
3. A public health emergency was declared in Puerto Rico in March.
4. The virus is spread by mosquitoes.
5. Many infected people don't get sick, but some experience headache, fever and flu-like symptoms.
6. So dear Severe cases can involve serious bleeding, shock and death.
7. There is no widely available medince for treating dengue infections.
8. Dengue remains less common in the continental U.S., but in the 50 states so far this year, there have been three times more cases and than at the same point last year. I'm Ed Donahue.