Microbial Safety of Milk from Small-Scale Dairy Farms in Northern Ghana

Abstract

Milk from small-scale dairy farms in Northern Ghana plays a vital role in food security and nutrition but remains highly vulnerable to microbial contamination due to inadequate hygiene practices and poor post-harvest handling. This study investigated the microbial safety of raw milk by analysing contamination levels and identifying key pathogens linked to dairy farming practices. A total of 99 milk samples (79 farm-sourced, 20 vendor-sourced) were collected across the Tolon, Sagnarigu, and Savelugu districts and analyzed using standard plate count methods and biochemical assays. Results showed that 92% of samples contained coliform bacteria , with vendor milk exhibiting significantly higher contamination levels ( 33.6% ) compared to farm milk ( 17% , p < 0.05). The most frequently isolated pathogens included Escherichia coli (39%), Bacillus cereus (32%), Klebsiella pneumoniae (10%), and Pseudomonas aeru ginosa (6.7%), with emerging contaminants such as Stenotrophomonas ma ltophilia also detected. A strong inverse correlation (r = −0.89, p = 0.0012) was observed between hygiene practices and contamination rates, underscoring the critical role of milk handling in microbial proliferation. These findings reveal substantial food safety risks associated with unregulated milk markets and highlight the urgent need for interventions, including improved hygiene protocols, veterinary oversight, and stricter monitoring of informal dairy supply chains. Given the presence of zoonotic pathogens, further research is needed to assess the long-term health implications of consuming contaminated milk in low-resource settings.