I've read that an airline pilot had it as early as 1958. Also that a teenager who died in 1969 was later analyzed and found to have had the virus. I also remember an article saying it was believed to have been found as early as the early 1930's.
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It was a wonderful community with some very enjoyable members. But the vast majority were like German housewives circa 1943 prenteding that horrib;le smell wafting through their open windowsd was just the neighbors having a cookout..--Windsock