I have just added a case study of how to identify species of Strongyloides, a gastrointestinal worm, if free-living females are found in human faecal specimens. It is particularly important to be confident a patient has Strongyloides stercoralis since this species causes a life-long infection that can cause serious disease and even death occasionally.
See this page.
Image of Strongyloides free-living females from Miles Beaman.
Posted by Rick Speare