difference (P b 0.05) in frequency of isolation of isolates with the virulent
genotypewas observed between the Gulf (39%) and Atlantic Coasts
(11%); however, the proportion of “other” genotypes [not virulent
(rrnB/vcgC) or less virulent (rrnA/vcgE or rrnAB/vcgE)] did not demonstrate
a significant geographic distribution (P = 0.801).
In regards to seasonal distribution of the more virulent