In Australian sheep, gastro-intestinal worms reduce productivity and also cause diarrhoea and faecal contamination that attracts blowflies, leading to flystrike. Moreover, the worms are now resistant to drugs and the use of 'mulesing' to avoid flystrike is no longer socially acceptable. Breeding worm-resistant sheep is very effective, but some resistant animals still develop diarrhoea because they become hypersensitive to mild worm infection.
Although not directly linked, you might find the following paper interesting.
https://www.ncbi.nlm.nih.gov/pubmed/27842872
This study evaluated resistance to commonly used antibiotics (in humans) among isolates causing clinical diseases in Australian animals. Among 324 E. coli isolates that were tested, resistance to tetracycline seemed to be common, followed by trimethoprim/sulphas and streptomycin and they were all susceptible to imipenem and amikacin.
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