Table 2.

Secondary transmission in the 2009 and 2012 outbreaks

	2009 outbreak [12]	2012 outbreak [11]
Included primary cases; clinical case definition, n	Not included	24
Included primary cases; laboratory-confirmed, n	8	9
Primary cases confirmed by IFAT/PCR, n/n	8/8	9/6
Primary cases subtyped as IIaA19G1R1, n	7	4
Household contacts examined*, n	23	83
Clinically defined secondary cases, n (%)	2 (9%)	7 (8%)
Secondary cases confirmed by IFAT (%)/PCR, n/n	4 (17%)/1	0 (0%)/0
Secondary cases subtyped as IIaA19G1R1, n	1	0

IFAT, Immunofluorescence antibody test; PCR, polymerase chain reaction.

^*All household contacts in 2012; only household contacts of laboratory-confirmed primary cases in 2009.