| http://www.w3.org/ns/prov#value | - The chemicals are speculated to concentrate up the food chain and weaken the Baikal seal's immune system, making them susceptible to diseases such as canine distemper and the plague, which was the cause of a serious Baikal seal epidemic that resulted in the deaths of thousands of animals in 1997 and 1999.[4] Baikal seal pups have higher levels of DDT and PCB than known in any other population of E
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