GALAXY: Bruce Arena's diagnosis: dengue fever

The illness that sent Galaxy coach Bruce Arena to a New Jersey hospital for two nights last week and kept him off the sideline in Saturday's 1-0 victory over the New York Red Bulls has been diagnosed as dengue fever.

Arena, who Tuesday ran his first practice session since returning from New Jersey, was likely infected during the Galaxy's trip to Puerto Rico for an Aug. 4 CONCACAF Champions League match against the Puerto Rico Islanders.

“It's likely that I was obviously bit by an infected mosquito,” Arena told media Tuesday. “The bloodwork is still days away, but that's most likely the case.”

Dengue fever is a mosquito-borne disease that is rare in the U.S., and it continues to slow down Arena, who spent Thursday and Friday night at a hospital in Hoboken.

“It certainly wasn't the flu -- I can promise you that,” Arena said Tuesday. “You're very ill. You have no appetite. You're exhausted. You have fevers. The other part of it is if it's not caught appropriately, it impacts some of your major organs.”

He said he's been treated for it and that it “will be like any other flu or fever at this point, [in] that it'll take you a couple of days to recover. It shouldn't have any long-term effects.”