Giardia infection can damage the lining of the small intestine, producing secondary lactase deficiency and temporary lactose intolerance. This page describes the clinical approach for this specific scenario.
Secondary lactase deficiency arises when a gastrointestinal infection damages the small intestine lining. Giardia — a parasite found in well water and fresh water from lakes and streams — is a recognised cause of this intestinal injury, resulting in temporary lactose intolerance.
The primary intervention targets the underlying giardia infection. An antibiotic-based treatment directed at the infection is the focus; the lactose intolerance is expected to resolve as a direct consequence. The full regimen and sequencing are available in the structured protocol.
Resolution of lactose intolerance, typically within three to four weeks once the lining of the intestines returns to normal.
Secondary Lactase Deficiency: The most common cause of temporary lactose intolerance in infants and young children is by an infection that affects the gastrointestinal tract and can damage the lining of the small intestine.
Giardia is a parasite that is found in well water and fresh water from lakes and streams.
Treatment of giardia infection with antibiotics will resolve the lactose intolerance.
The lactose intolerance usually resolves within three to four weeks when the lining of the intestines returns to normal.
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