Scientists from the University of the Philippines – Diliman College of Science have uncovered alarming levels of multidrug-resistant (MDR) salmonella in chicken sold at public markets across Metro Manila.
Led by Michael Joseph Nagpala, Jonah Feliza Mora, Rance Derrick Pavon, and Windell Rivera, the study involved whole genome sequencing and antimicrobial resistance testing on poultry samples gathered from San Juan, Quezon City, Malabon, and Muntinlupa.
The team aims to identify the dominant salmonella strains, assess their ability to cause disease, and map out antimicrobial resistance genes (ARGs) that pose serious risks to food safety and public health.
Their findings showed that Salmonella infantis was the most common strain detected — mirroring trends seen in the U.S., Europe, and other parts of Asia. Other detected types included Brancaster, Anatum, London, Uganda, and Derby, all carrying various virulence and resistance traits.
Notably, the scientists also identified a rare strain, Salmonella Isangi, marking the first reported detection of this type in the Philippines. Previous sightings of Isangi were linked to poultry production in Brazil and South Africa.
In total, the team found 50 antimicrobial resistance genes, indicating resistance to 12 different drug classes, and highlighting serious concerns about the spread of MDR pathogens through food animals. The study warns that inappropriate antibiotic use in livestock and healthcare is contributing to this growing problem.
The researchers emphasized the urgent need to curb the spread of MDR salmonella to humans, other animals, and the environment.