Ghana sheep pneumonia study highlights pathogen mix and drug resistance

A new abattoir-based study from Ghana found that Mannheimia haemolytica was the leading bacterial isolate in pneumonic sheep lungs, appearing in 54.7% of 75 sampled lungs collected at the Tamale and Kumasi abattoirs. Other organisms included Staphylococcus aureus (46.7%), E. coli (37.3%), Klebsiella spp. (19.7%), and Pasteurella multocida, with M. haemolytica especially associated with broncho-interstitial and interstitial pneumonia. In susceptibility testing performed with the Kirby-Bauer method under CLSI veterinary standards, M. haemolytica and P. multocida were most susceptible to cefotaxime, ciprofloxacin, and, to a lesser extent, ampicillin, while showing substantial resistance to amoxicillin, doxycycline, and penicillin G. The paper was published in Frontiers in Veterinary Science on May 8, 2026. (frontiersin.org)

Why it matters: For veterinary professionals, the study adds lesion-linked bacteriology and susceptibility data from a region where sheep pneumonia and antimicrobial use patterns are underreported. The findings reinforce that ovine respiratory disease is often polymicrobial, that M. haemolytica remains a central pathogen, and that empiric reliance on older, widely used drugs may miss the mark in some settings. The authors also flag a broader One Health concern: resistant bacteria recovered from sheep lungs entering the food chain may have implications beyond flock health, especially in slaughter environments. That said, this was a small, abattoir-based cross-sectional study using culture and biochemical identification without molecular confirmation, so the results are best read as a local signal rather than a universal treatment guide. (frontiersin.org)

What to watch: Watch for follow-up flock-level or longitudinal studies in Ghana and West Africa that use PCR or sequencing to confirm pathogen identity and track resistance trends over time. (frontiersin.org)