Clinical characteristics of episodes of invasive pneumococcal disease in housed and homeless adults, Toronto, 2002–2006.

*Any underlying condition that would make person eligible for pneumococcal vaccination [16].†Because of difficulty contacting homeless persons post-discharge, a much higher proportion of data is missing for homeless persons.§Receiving antibiotics for this episode of illness when positive blood/sterile site culture obtained.¶Excluding cases with hospital-acquired disease.‡Death during hospitalization.**Denominators vary, because not all information is available for all cases.††For the age-matched analysis, each homeless case was matched to the four non-homeless cases closest in age.