26/10/2026
Super el. Nino is impending 😢
BEYOND FLOODWATERS! 🦠🔬
“The absence of isolated hotspots is itself the alarming part.”
Scientists from the University of the Philippines Diliman (UPD) have discovered leptospirosis-associated bacteria across all five sampled locations along Estero de Paco in Manila, suggesting that potential sources of infection are not confined to isolated contaminated areas.
The findings, released by the UP Diliman College of Science on October 21, 2026, challenge the common perception that leptospirosis exposure is primarily associated with floodwaters following heavy rainfall.
Researchers Ram Julius L. Marababol and Dr. Windell L. Rivera examined soil and water samples from five locations along the urban waterway, analyzing 448 bacterial isolates.
They detected Leptospira bacteria at every sampling location, with no statistically significant differences between upstream and downstream sites or between soil and water samples.
More importantly, genetic analysis identified two strains carrying the lipL32 gene, a marker associated with disease-causing Leptospira. Both were identified as Leptospira yasudae, marking the first genetic sequencing of this species from Philippine environmental samples.
The researchers also produced the first draft genome of L. yasudae recovered from Philippine soil, containing approximately 4.5 million DNA base pairs.
Their findings suggest that managing leptospirosis risks requires monitoring entire urban waterways rather than focusing only on visible contamination hotspots.
However, the studies did not determine how many people were infected or establish a connection to recent increases in leptospirosis cases.
Supported by the Department of Science and Technology (DOST), the research highlights the importance of continuous environmental surveillance, especially in densely populated and flood-prone communities.
The discovery expands scientific understanding of leptospirosis risks beyond seasonal flooding and provides valuable genetic evidence for improving disease monitoring in the Philippines.