Faecal analysis: Samples will be collected in anaerobic collection bags with an aliquot to be transferred into a provided screw top plastic jar, both to be frozen at -20°C for short term storage and transport, and stored at -80°C long-term for parasite egg quantitative polymerase chain reaction (qPCR) analysis to be performed by nominated un-blinded personnel supervised by Prof. James McCarthy at QIMR Berghofer Medical Research Institute, with the results to remain blinded to all other trial personnel. Faecal samples will also be stored for future analysis of bacterial communities (the microbiota).