the four-year old bear died suddenly, at hundreds of German viewers polar bear Knut drowned he fell into a pool of water in its case after collapsing as a result of a brain swelling, experts said."Significant changes to the brain" had revealed signs of post-mortem studies in Berlin Zoo.
Senior veterinarians now say that these changes were probably caused by an infection caused the bear brain to thresholds.
Four-year old Knut died suddenly in the Zoo of hundreds. Large amounts of water were found in his lungs.
"We believe that this presence of infection must be already there months been for a long time... at least several weeks, possibly" Achim Gruber, Professor of veterinary medicine at the free University of Berlin's, said.
He added that although Knut in the water had fallen, it is likely that he would not have survived. A pathology team still looking for the exact cause of the disease in the coming weeks.
Knut was hand raised by Zoo Keepers, after formerly a circus bear his mother in East Germany.
Knut has generated more than EUR 5 million (￡ 4. 4 m, $7 million) in extra income for Berlin Zoo since its birth in a passion as Knutmania.
Reports that he may be stuffed and on display at the Berlin Museum of natural history, as part of an exhibition on climate change, have prompted some anger among his fans.
Reuters reported that a "stop the filling of Knut" demonstration at the Zoo on Saturday planned is.
Polar bears can live for 15 to 20 years in the wild and even longer in captivity.
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