In North America, meningococcal disease occurs at a rate of I case per 100000 population per year, producing 2725 cases notified in the US in 1998 and 155 laboratory confirmed cases in Canada in the same year. A majority of these cases occur in the winter season and in early childhood, with a case fatality rate of approximately 10%. There has been an increase in the proportion of cases due to serogroup Y meningococci over the past decade: in 1995-98 in the US, 33% of cases were due to serogro...Expand abstract
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Meningococcal disease and vaccination in North America.
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