Table 3. Percentage of PFGE profiles and MLVA types identified and Simpson diversity index calculated for PFGE and MLVA in the three study periods.

Method	Genetic diversity analysis	Time periods
		1986–1997	1998–2003	2007–2015
PFGE	Diversity (%)	23.2	12.2	10.3
	Simpson diversity index	0.88	0.70	0.82
MLVA	Diversity (%)	39.3	25	14.3
	Simpson diversity index	0.89	0.52	0.33