Centers for Disease Control and
Prevention/Reuters - West Nile virus, spread by mosquitoes, can lead to
inflammation of the brain, damaging its speech, language and thinking
centers.
You need the mosquitogone report to protect you from the west nile virus...
One doctor, Art Leis in Jackson, Miss., has seen the virus damaging the speech, language and thinking centers of the brain — something he has never observed before. The other, Elizabeth Angus in Detroit, has noticed brain damage in young, previously healthy patients, not just in older, sicker ones — another change from past years.
But a scientist for the Centers for Disease Control and Prevention said the federal agency has not seen any evidence that the virus is causing a different type of brain damage. He said doctors may be seeing more-serious cases this year because there are more cases overall. But he acknowledged that the CDC does not collect the granular data needed to quickly determine whether the virus is causing more-severe brain damage.
“I’ve been struck this year that I’m seeing more patients where the brain dysfunction has been very much worse,” said Angus, of Detroit’s Henry Ford Hospital. “It makes you wonder if something’s different, if something’s changed.”
And while the virus in the past has typically invaded the brain and spinal cord only of people who have weakened immune systems, such as the elderly and transplant or cancer patients, Angus this summer treated a severely affected woman in her 20s and a man in his 40s.
Leis said he is seeing much more severe encephalitis — inflammation of the brain — than he has in the past. “It is clearly much more neuroinvasive, neurovirulent,” he said.
Four patients Leis treated this summer had lost their ability to talk or write. Another was paralyzed on one side, as often seen in strokes, not West Nile infections. Others experienced recurring seizures.
In all, 11 of the first 12 patients Leis saw this year at the Methodist Rehabilitation Center in Jackson had more severe brain damage than he had seen previously. The outlook for such patients varies, but most will face years or a lifetime of disability.
“For the first time, we have radiographic evidence, clinical evidence of the virus attacking the higher cortical areas,” said Leis, who has published 15 scientific papers describing previous West Nile patients.
Marc Fischer, a CDC epidemiologist who tracks the West Nile virus, said the agency has not noticed the changes described by Leis and Angus. “There’s just a lot more cases this year than anybody has seen in at least 10 years,” he said. “You’re just going to see more severe cases and probably a broader variety of manifestations.”
