138 / 144 danmap 2015 138 9. materials and methods ed known mrsa-positive household members or other close contacts. due to the increasing numbers of cases belonging to cc398, this type was treated separately as both epidemiology and relevant exposure are different from other ca cases. streptococcus pneumoniae , streptococcus pyogenes (group a streptococci), group b, c and g streptococci.