Which of the following infestation is associated with autoinfection?
Auto Infective life cycle is present in Strongyloides stercoralis. In this cycle, the rhabditiform larva's passage through the colon to the outside world is delayed by constipation or other factors. This allows it to transform into an infective filariform larva while still within the body of its host. This larva may then invade the internal mucosa (internal autoinfection) or perianal skin (external autoinfection) without an intervening soil phase. Strongyloidiasis is diagnosed by the presence of the larvae in the stool. When it is absent in the stool, it can be isolated from duodenal or jejunal aspirates. Enzyme-linked immunosorbent assays for antibodies to excretory-secretory or somatic antigens are now available in reference laboratories. Ref: Ray C.G., Ryan K.J. (2010). Chapter 53. Intestinal Nematodes. In C.G. Ray, K.J. Ryan (Eds), Sherris Medical Microbiology, 5e.
Ascaris lumbricoides
Strongyloides
Giardia
Gnathostoma