Thursday 10 November 2005
The stomach is not a preferred site for human parasitic infections. Cryptosporidium spp. has been found lining the gastric mucosa, which was virtually free of inflammation.
Several cases of giardiasis have been reported, virtually all in stomachs with extensive atrophy and intestinal metaplasia.
Because most patients also have H. pylori infection, it remains unclear whether Giardia intestinalis causes gastritis.
Strongyloides stercoralis has been found in the stomach of patients with widespread infections. Larvae and, more rarely, adults are buried in the gastric mucosa.
The responses range from the complete absence of inflammation to granulomas engulfing fragments of parasites. Rarely, widespread mucosal damage, hemorrhage, and necrosis have been described.
Anisakis larvae ingested by eating raw fish may penetrate and even perforate the gastric wall.
In the few surgically resected specimens available for examination during this event, large numbers of eosinophils have been observed at the site of penetration, whereas a granulomatous reaction usually surrounds the parasitic organisms in chronic cases
giardiasis (Giardia intestinalis)
- infectious gastritis
- viral gastritis
- bacterial gastritis
- fungal gastritis
- parasitic gastritis