Prospective hospital-based case–control study to assess the effectiveness of pandemic influenza A(H1N1)pdm09 vaccination and risk factors for hospitalization in 2009–2010 using matched hospital and test-negative controls

Table 4 pH1N1 vaccination status in HIV infected ARI cases and controls

	HIV positive ARI cases			HIV positive hospital controls	Total
pH1N1 vaccination	pH1N1 positive	pH1N1 negative	pH1N1 status unclear*	HIV positive hospital controls	Total
Vaccinated**	2	4	2	2	10
Not vaccinated	1	9	1	1	12
Unclear	0	0	0	1	1
Total	3	13	3	4	23

*Swabbed late and did not provide serum samples.
**Single dose of Pandemrix 28–110 days prior to symptom onset with exception of one pH1N1-negative ARI case with 2 doses 119 and 91 days prior to symptom onset.

ISSN: 1471-2334