Table G.1.

Search string used for a literature search on alternatives to the use of antimicrobials (probiotics and other living organisms, prebiotics, botanicals, enzymes, bacteriocines, antibodies, organic acids, bacteriophages, metals and immunomodulators)

Search terms	Field searched
antibiotic* OR antimicrobial* OR bacteria*	Title
AND
animal* OR livestock OR cattle OR cow* or bovine* OR goat* OR sheep OR ovine* OR caprine* OR pig* OR swine OR poultry OR chicken* or hen* OR horse* OR soliped* OR fish* OR aquaculture OR bee* OR game* OR rabbit* OR pork	Topic
AND
replace* OR alternative* OR prebiotic* OR probiotic* OR “feed additive*” OR bacteriophage* OR phage* OR enzyme* OR “organic acid*” OR “heavy metal*” OR competitive OR defensin* OR bacteriotherap* OR “faecal transplantation*” OR antibod* OR lysin* OR bacteriocin* OR lysozym* OR lactoferrin* OR immunomodul* OR immunemodul* OR immuno‐modul* OR immune‐modul* OR “immuno modul*” OR “immune modul*” OR immunostimul* OR immunestimul* OR immuno‐stimul* OR immune‐stimul* OR “immuno stimul*” OR “immune stimul*”	Title
AND
disease* OR resistan*	Topic
AND
antimicrobial* OR antibiotic*	Topic
NOT
wom$n OR m$n OR children OR patient*	Topic