The rat pulmonary artery nematode, Angiostrongylus cantonensis (discovered in rats from the province of Canton, southern China, in 1933 ) is the main cause in humans of what is known as eosinophilic meningoencephalitis (EEM), with around of 3,000 confirmed cases in various parts of the world.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11566426PMC

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