(CNN) A Michigan man went from healthy to brain dead in just nine days after contracting Eastern equine encephalitis, his brother said.

Gregg McChesney, 64, was a "perfectly healthy, happy human being" less than two weeks before his August 19 death from the rare mosquito-borne virus, Mark McChesney told CNN affiliate WOOD

"...Within a matter of nine days he went from perfectly healthy to brain dead," Mark McChesney said. "All of a sudden he had a seizure and next thing you know, he's in the ER and he just never came out of it."

Mark McChesney said he was working with his brother less than a month before that trip to the emergency room.

"Late July, he was here at the farm helping me put docks in at the pond," Mark McChesney told the station.

Read More