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They skipped the Greek letter "Xi"; no prizes for guessing why.

Because the WHO has a long-standing policy not to name disease after names.

So why didn't they skip "Mu", which as others have pointed out is a far more common name than Xi?

Everyone knows the real reason they skipped Xi, you're not fooling anybody.

Occam's razor, no one mentioned that Mu was a common name at the time.