Key
Conn= Connecticut, Fla=
Florida, H120= Holland, Mass= Massachusetts, Beau= Beaudette, Variant 1
and Variant 2 are from Israel, CAV= California variant, Ark= Arkansas,
CU-T2= Cornell University, GAV= Georgia variant, D274, D207, and D1466=
Dutch isolates, UK/167/84= United Kingdom isolate, DE072= Delaware
isolate.
As a general rule, isolates less than 89% similar are different serotypes, with the exception that Conn 46 and Fla 18288 are 96% similar but are different serotypes, indicating that only a few changes in the right place are required to change the serotype.
Phylogenetic tree provided by Dr. Mark Jackwood