Aust N Z J Med. 1986 Feb;16(1):78-9.

Giardia infection causes vitamin B12 deficiency.

Abstract

A patient presented with hematological evidence of vitamin B12 deficiency. The Schilling test performed suggested intestinal malabsorption and further investigation revealed heavy infestation with Giardia lamblia. Specific treatment of the giardiasis with tinidazole resulted in correction of the abnormalities in vitamin B12 absorption. These findings, together with the absence of other causes of vitamin B12 deficiency, suggest that giardiasis should be considered as a cause of vitamin B12 deficiency.

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Vitamin B 12

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Giardiasis--a cause of vitamin B 12 malabsorption. [Am J Dig Dis. 1973]
Giardiasis--a cause of vitamin B 12 malabsorption.
Cowen AE, Campbell CB. Am J Dig Dis. 1973 May; 18(5):384-90.
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[Polyneuropathy caused by vitamin B12 deficiency secondary to chronic atrophic gastritis and giardiasis].
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Cited by 2 PubMed Central articles

Review From Leningrad to the day-care center. The ubiquitous Giardia lamblia. [West J Med. 1990]
Review From Leningrad to the day-care center. The ubiquitous Giardia lamblia.
Shandera WX. West J Med. 1990 Aug; 153(2):154-9.
Review Giardiasis. [Clin Microbiol Rev. 1992]
Review Giardiasis.
Wolfe MS. Clin Microbiol Rev. 1992 Jan; 5(1):93-100.

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