What's the bacterium behind AFB?

I thought there was a reclassification of the
bacterium behind AFB, 'Paenibacillus larvae', or
(P. larvae) is the agent behind American foulbrood
(AFB).

But some are stating that AFB is caused by the
spore-forming bacterium 'Bacillus larvae', or (B.
larvae)

Which is it?
Thanks!
Joe

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