Estimation of type- and subtype-specific influenza vaccine effectiveness in Victoria, Australia using a test negative case control method, 2007-2008

Table 2 Study inclusion and exclusion criteria by year, 2007-2008

Criteria	2007		2008
	Excluded	Included	Excluded	Included
Inclusion
Respiratory swabs of ILI patients submitted by GPs	0	480	0	407
Exclusion
Influenza result unknown	0	480	0	407
Vaccination status unknown	8	472	4	403
Symptom onset to specimen collection interval unknown	41^a	434	22^a	384
> 4 days between symptom onset and specimen collection	50^b	386	54	330

ISSN: 1471-2334