Giardia in Calves (Giardia duodenalis)

What is Giardia duodenalis?

Giardia duodenalis is a single-celled small-intestine parasite with a two-phase life cycle: vegetative trophozoites colonize the small intestine, while environmentally resistant cysts are excreted in feces and represent the persistent infectious form.

Transmission in young ruminants

Transmission occurs via the fecal-oral route through the ingestion of cysts. In young ruminants, Giardia duodenalis is a common intestinal finding and is predominantly subclinical.

Significance in calf diarrhea

A causal role in acute neonatal calf diarrhea has not been established. An association with chronic, mucoid diarrhea and reduced weight gain has been described in individual animals. Giardia frequently occurs in conjunction with other enteropathogenic pathogens.

Diagnosis and Interpretation of Findings

Detection of this pathogen expands the range of pathogens examined in cases of diarrhea. Given its frequently subclinical nature, a positive result must be evaluated within the clinical context and in conjunction with the other findings.

Rapid Test Components

The Fassisi® BoDia + Gia and BoDia Advanced MPX tests detect Giardia duodenalis alongside other calf diarrhea pathogens in calf feces, thereby enabling the differentiation between single and mixed infections from a single sample.

An overview of the sources used can be found here.