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The newspaper article excerpt below describes a truly horrifying situation. I hate to think of the suffering the poor animals had to endure, ending in their deaths...
Many horses have died in Kittson County the past week or 10 days. Recently, examination of one of the dead animals showed the presence of hundreds of mosquitos in the lungs of the animal. This year the pests are in evidence by billions. The rural sections, where grass is growing, is simply alive with huge swarms of them. It is presumed horses could not breath without inhaling hundreds of them, which in turn set up infection, killing them.
From: Kittson County Enterprise (1937) - Which was ironically the same year that the first definitive work on mosquitoes in Minnesota was written by Dr. William Owen of the University of Minnesota.