National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine adult female male middle aged risk factors case-control studies substance abuse disease outbreaks* streptococcal infections / epidemiology* intravenous / complications* streptococcal infections / etiology switzerland / epidemiology streptococcus pyogenes* / isolation & purification pmid:10756152 pmc2640854 doi:10.3201/eid0602.000211 l m böhlen k mühlemann m g täuber abscess / etiology needles / adverse effects streptococcal infections / complications* streptococcus pyogenes* / classification streptococcus pyogenes* / pathogenicity