The migration of bacteria through gels in the presence of IUCD monofilament tails.

An in vitro model was developed to investigate the migration of a variety of bacteria of different characteristics through a gel system in the presence or absence of a wide range of polymer monofilament threads. The bacteria were unable to migrate through the gel from the point of inoculation in the absence of a solid substrate. Migration occurred along all thread types tested, including those used as IUCD marker tails and the extent of bacterial migration appeared to be determined primarily by the motility of the microorganisms. The implications of these findings in relation to the development of pelvic infections in IUCD wearers is discussed.