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Necrotising enteritis caused by Clostridium perfringens type C (CwC) is an important cause of morbidity and death in highland regions of Papua New Guinea (PNG) and the organism is readily isolated from clinical cases. Although detected in fluorescent antibody stains of faecal cultures, CwC has previously only once been isolated from normal people or from pigs in PNG. The difficulty results from the greater numbers of the much more common Cl. perfringens type A (CwA) which is morphologically and culturally indistinguishable from CwC. Separation of CwC from the more numerous CwA has been achieved by utilising their antigenic dissimilarity. Silicate beads covered with specific antibody to CwC added to a mixed culture bound CwC cells while most of the unbound cells were washed away. When the beads were plated out type C organisms were recovered. In laboratory tests CwC was isolated from mixtures with CwA where the type A organisms predominated by one million to one. With this system type C organisms have been isolated from human and pig faeces from PNG.
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