Pneumococcal infections have increased during the last 10 to 15 years in No
rway. Their incidence is now about 20 per 100 000 population for all age gr
oups, but is 2 to 3 times higher among the elderly. In 1996, the Advisory B
oard of Infectious Disease Control, National Institute of Public Health, No
rway, recommended that pneumococcal polysaccharide vaccine should be admini
stered to all individuals aged greater than or equal to 65 years. This reco
mmendation has led to an increased use of pneumococcal vaccine, with a mark
ed peak during the influenza vaccination season.