Table 2.

Reporting trends for seizure reports after 2014-2015 inactivated influenza vaccines (IIV) compared to 2013-2104 through 2004-2005 influenza seasons. Note the higher proportion of seizure reports among children aged 6-23 months during 2010-2011 (24.83%) and 2011-2012 (30.8%) influenza seasons compared to other seasons. 2010 – 2011 is the season during which a febrile seizure signal first appeared in VAERS and it continued for one more season.

Reporting trends of SEIZURE Reports with Onset Interval 0-1 Day Following 2014-15 Inactivated Seasonal Influenza Vaccines (IIV)a Compared to 2013-14 Inactivated Seasonal Influenza Vaccines (IIV) through 2004-05 (IIV) (by season) By age-group and all ages, initial domestic reports only, VAERS reports as of 03/27/2015b
	6-23 mos		2-4 yrs		All ages
Season	Total Reports	Seizure N (%)	Total	Seizure N (%)	Total Reports	Seizure N (%)
2014-15 IIV	174	27 (15.52%)	151	4 (2.65%)	6000	75 (1.25%)
2013-14 IIV	175	30 (17.14%)	162	13 (8.02%)	5960	93 (1.56%)
2012-13 IIV	155	16 (10.32%)	156	11 (7.05%)	5513	69 (1.25%)
2011-12 IIV	276	85 (30.80%)	147	12 (8.16%)	5088	140 (2.75%)
2010-11 IIV	298	74 (24.83%)	223	16 (7.17%)	5930	140 (2.36%)
2009-10 IIV	253	36 (14.23%)	216	13 (6.02%)	4342	94 (2.16%)
2008-09 IIV	183	30 (16.39%)	148	6 (4.05%)	2960	63 (2.13%)
2007-08 IIV	224	50 (22.32%)	152	12 (7.89%)	2336	78 (3.34%)
2006-07 IIV	169	31 (18.34%)	134	2 (1.49%)	1836	46 (2.51%)
2005-06 IIV	159	23 (14.47%)	112	5 (4.46%)	1847	47 (2.54%)
2004-05 IIV	153	26 (16.99%)	70	3 (4.29%)	978	33 (3.37%)

Seizure: MedDRA Codes Convulsion, Grand Mal Convulsion, Status Epilepticus, Convulsions Local, Febrile Convulsion

Reports with missing age and age 0 -5 months old were excluded

Vaccines type includes Inactivated only

^aIIV Includes all inactivated influenza vaccines (IIV3, IIV4, RIV3, ccIIV3)

^bVaccination and Receive Date falls between 07/01 - 03/27 Per Season