Jerry writes:
> Actually, we've had AHB in USA since 1970s.  

Honeybees from the commercial populations of Canada,
the USA and Australia have between 0.3 and 32.8%
African alleles on per individual basis with this test, similar
to that found in previous tests completed with more SNPs. 

There is no evidence that A. m. scutellata was
ever deliberately introduced into Australia, Canada or
the USA. However, there is good evidence of early
importations of honeybees from North Africa into both
the US and Australia.

-- A SNP test to identify Africanized honeybees via proportion of ‘African’ ancestry (2015)

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