Lao PDR: An Exemplar in Malaria Subnational Tailoring

Between 1997 and 2024, malaria cases in Lao PDR declined from 462,000 to just 342. A key driver of this success was the use of local data and contextual information to tailor interventions to specific areas, a concept known globally as subnational tailoring (SNT), which optimizes impact on disease transmission. As case counts fell, the World Health Organization (WHO) launched a regional elimination strategy for the Greater Mekong Subregion in 2015, setting a target of eliminating all malaria species across the region by 2030. Lao PDR then leveraged SNT to develop its own National Malaria Strategic Plan, aligning national priorities with the regional goal. Two years later, malaria surveillance was integrated into a national digital platform for the first time, an upgrade from the old paper-based system. Building on a stronger surveillance foundation, Lao PDR conducted a more granular stratification exercise in 2019, which was updated in 2022 and 2024 as the surveillance system strengthened and transmission patterns shifted.

Throughout its stratification and elimination efforts, Lao PDR has adopted several promising practices, including:

• Development of a robust, DHIS2-based digital surveillance system that established a strong foundation for stratification, creating real-time visibility of data at the village level, including individual case tracking.

• External partnerships and collaboration that enabled alignment between partner efforts and national objectives, supporting the development of an adaptive approach to malaria stratification and elimination.

• Targeted district-level strategies that concentrated interventions and case management in specific geographies to ensure resources were directed to where transmission was most persistent.

• Engagement of highly skilled frontline malaria workers who dramatically expanded reach and improved data quality, particularly in mobile, remote, and linguistically diverse communities.

Lao PDR has achieved a dramatic decrease in malaria cases: total confirmed cases fell from 35,888 in 2015 to 342 in 2024 — a decline of over 99% — and malaria deaths also reached zero by 2024. The country's experience demonstrates how granular stratification can guide a malaria program from high burden to near elimination, offering a model for countries navigating the final phase of malaria control.