Compositions for the inhibition of Giardia lamblia

A method of reducing the development of giardiasis in a subject, comprising administering a composition exhibiting a bile-salt hydrolase activity to a subject;

• wherein said composition is chosen from:
• a composition comprising at least one bile-salt hydrolase (BSH) enzyme, wherein said BSH enzyme has an amino acid sequence at least 95% identical to SEQ ID NO:
• 6;
• a composition comprising a lactic acid bacterium able to secrete at least one BSH enzyme, wherein said BSH enzyme has an amino acid sequence at least 95% identical to SEQ ID NO:
• 6, and wherein said lactic acid bacterium is not Lactobacillus johnsonii La1, Lactobacillus acidophilus, Bifidobacterium bifidum or Bifidobacterium infantis;
• and
• a combination thereof;
• wherein said bile-salt hydrolase activity is determined by the detection of the presence of glycine or taurine liberated from conjugated bile salts, of cholic acid, of deoxycholic acid and/or of chenodeoxycholic acid.