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STUDY OBJECTIVE To determine the source and the extent of a community wide outbreak of gastroenteritis. DESIGN A matched case-control study with postal questionnaires. Subtyping of campylobacter strains by pulsed field gel electrophoresis (PFGE). SETTING A rural municipality with a population of 8600 in southern Finland, August 2000. Two thirds of the(More)
BACKGROUND The 23-valent pneumococcal polysaccharide vaccine (PPV23) is recommended for persons aged < 65 years with chronic medical conditions. We evaluated the risk and mortality from invasive pneumococcal disease (IPD) among persons with and without the underlying medical conditions which are considered PPV23 indications. METHODS Population-based data(More)
BACKGROUND Sindbis virus (SINV) is an arthropod-borne alphavirus that causes rash and arthritis. In Finland, epidemics occur cyclically, but factors associated with clinical SINV infection are largely unknown. We conducted a population-based case-control study during the epidemic year 2002. METHODS SINV cases were serologically confirmed and reported to(More)
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