Table 2. Most recent medically-attended infection diagnoses within 1 through 42 days prior to confirmed Guillain-Barré syndrome (GBS) onset, by recent influenza vaccination^a status, Vaccine Safety Datalink, 2009–2011.

Infection type	ICD-9-CM Code	Description	Patients with infection and influenza vaccination 1 through 42 days prior to GBS onset (n = 3)	Patients with infection but no influenza vaccination 1 through 42 days prior to GBS onset (n = 41)b
Upper or lowerrespiratory tract	382.9	Unspecified otitis media	–	5
	460	Acute nasopharyngitis	–	1
	461.9	Acute sinusitis unspecified	–	2
	462	Acute pharyngitis	–	3
	463	Acute tonsillitis	–	2
	464.00	Acute laryngitis and tracheitis without obstruction	–	1
	465.9	Acute upper respiratory infections of unspecified site	3	6
	466.0	Acute bronchitis	–	4
	482.42	Methicillin resistant pneumonia due to Staphylococcus aureus	–	1
	486	Pneumonia, organism unspecified	–	7
	487.1	Influenza with other respiratory manifestations	–	2
	490	Bronchitis not specified as acute or chronic	–	7
	510.9	Empyema without fistula	–	2
	513.0	Abscess of lung	–	1
Gastrointestinal	008.45	Intestinal infection due to Clostridium difficile	–	1
	008.8	Intestinal infection due to other organism not elsewhere classified	–	1
	009.0	Infectious colitis enteritis and gastroenteritis	–	1
	009.2c	Infectious diarrhea	–	1
Unspecifiedviral infection	079.99	Unspecified viral infection	–	2

^a2009–10 monovalent inactivated influenza vaccine or 2010–11 trivalent inactivated influenza vaccine.

^bThere may be >1 medically-attended infection diagnosis on the same day, resulting in more infection diagnoses than GBS patients.

^cThe patient with a diagnosis of infectious diarrhea also tested positive for Campylobacter jejuni.