Weekly IDSR Bulletin

Detailed Bulletin Analysis

The national reporting performance for Epidemiological Week 17 has achieved a highly positive trajectory, reaching 97.1% for completeness and 91.0% for timeliness on the One Health Surveillance Platform (OHSP). This solid performance highlights the continued capacity of the surveillance system to receive and process crucial epidemiological data. Out of the 33 designated national reporting sites, 26 (78.8%) managed to successfully meet the minimum national target of 80% or greater on both key surveillance quality indicators. This extensive tracking provides health administrators with high-resolution clarity on circulating pathogens across the territory.

In contrast to the performance regressions experienced during Week 16, where completeness fell to 92.7% and timeliness plummeted to 88.9%, Week 17 demonstrates a major and highly commendable recovery. Completeness expanded by 4.4 percentage points, while timeliness climbed by 2.1 percentage points, returning the system to standard baseline goals. This stabilization was primarily driven by the recovery of Central Hospitals, which achieved an outstanding 100% in completeness and 100% in timeliness, bouncing back fully from their poor 75% performance in Week 16. However, Mulanje DHO and Zomba DHO failed to hit target levels on both metrics, while Machinga, Dowa, Karonga, and Balaka fell short specifically on timely submissions.

Moving forward, the National IDSR Secretariat recommends that immediate, customized supervisory visits are made to Mulanje and Zomba DHOs to eliminate the local barriers causing delayed reporting. Additionally, District Health Coordinators in Machinga, Dowa, Karonga, and Balaka must implement daily internal quality checks to make sure that the crucial Monday 10:00 AM reporting deadline is met. Sustaining this high-level momentum remains essential to preserve the system’s early warning capabilities, especially during ongoing cholera and measles outbreaks.

Detailed Bulletin Analysis

Malaria continues to stand as the most significant clinical burden within the public health sector of Malawi, with Epidemiological Week 17 recording 26,959 clinical cases and 6 confirmed inpatient deaths. This heavy volume of febrile cases places continuous stress on diagnostic laboratories, primary healthcare providers, and essential drug inventories. The persistent transmission across the districts highlights the constant need for robust environmental, preventative, and curative interventions at all levels of care.

Comparing these statistics to the preceding Epidemiological Week 16, we observe a notable downward trend in overall morbidity but a slight increase in mortality. Clinical cases fell by 13.2%, decreasing from 31,044 in Week 16 down to 26,959 cases in Week 17. Conversely, weekly malaria-associated deaths experienced a minor rise, moving from 5 to 6. This mixed signal—fewer clinical cases but slightly higher mortality—suggests that while environmental transmission may be starting to diminish, severe clinical complications are still causing fatal outcomes, potentially due to delayed presentation at health facilities.

To mitigate severe complications and clinical mortality, it is highly recommended that clinical teams perform thorough audits of the 6 recorded deaths to identify and address any delays in administering intravenous artesunate. At the same time, District Health Offices must ensure the continuous availability of Rapid Diagnostic Tests (RDTs) and Artemisinin-based Combination Therapy (ACTs) in rural dispensaries. Furthermore, Health Surveillance Assistants (HSAs) should intensify localized communication campaigns urging community members to seek medical evaluation within 24 hours of fever onset.

Detailed Bulletin Analysis

The monitoring of enteric pathogens during Epidemiological Week 17 shows 620 cases of Bloody Diarrhoea and 58 cases of Typhoid fever. Enteric transmission risks remain concentrated in urban and peri-urban locations with compromised water and sanitation systems. To address these threats, the National IDSR recommendations explicitly target Blantyre, Lilongwe, and Mchinji DHOs, requiring immediate field investigations to identify the contamination sources driving these persistent Typhoid fever clusters.

When evaluated against the previous Epidemiological Week 16 data, both enteric indicators experienced a significant and welcome decline. Typhoid cases dropped by 35.6%, falling from 90 cases down to 58, and Bloody Diarrhoea decreased by 9.8%, dropping from 687 cases to 620. This positive change suggests a reduction in overall enteric disease transmission. However, despite the lower national numbers, the persistence of localized clusters in Blantyre, Lilongwe, and Mchinji demonstrates that localized pathogen sources continue to present transmission risks.

Accordingly, we recommend that Blantyre, Lilongwe, and Mchinji DHOs deploy rapid environmental teams to conduct systematic water quality testing, focusing on municipal lines and shallow wells in the catchment areas of high-reporting clinics. Clinicians are advised to maintain a high index of suspicion, ordering blood and stool cultures for all patients presenting with persistent, step-ladder fever patterns. In addition, local sanitation campaigns, water chlorination programs, and food safety inspections in busy market areas must be scaled up to prevent the re-emergence of larger outbreaks.

Detailed Bulletin Analysis

Epidemiological Week 17 has registered an increase in suspected Cholera activity, with 255 suspected cases and 25 confirmed cases recorded, alongside a commendable zero-death record. This stable clinical survival rate reflects the high quality of supportive rehydration and prompt case management within established Cholera Treatment Units (CTUs). On the zoonotic disease front, Mpox surveillance recorded an encouraging result with zero (0) new confirmed cases and zero (0) alerts reported, keeping the cumulative national total stable at 157 confirmed cases since April 2025.

A comparison with Epidemiological Week 16 shows that the Cholera situation continues to expand in volume. Suspected Cholera cases rose by 26.9%, climbing from 201 in Week 16 up to 255 in Week 17, and confirmed cases increased from 15 to 25. This rising trend indicates active transmission chains in several key districts (particularly Blantyre, Mulanje, and Zomba). Conversely, the Mpox situation remained quiet, moving from 2 suspect alerts in Week 16 to absolute zero in Week 17, confirming that the outbreak remains under tight control.

To counter the growing Cholera threat, the National Incident Management System must continue to direct emergency water, sanitation, and hygiene (WASH) resources to high-incidence hotspots. In addition, CTU inventories of Oral Rehydration Salts (ORS), IV fluids, and rapid cholera tests must be restocked to prevent shortages. While Mpox reported zero activity, cross-border coordination with Mozambique and Tanzania must be maintained to make sure any imported cases are detected and managed promptly.

Detailed Bulletin Analysis

Severe Acute Respiratory Infections (SARI) presented 107 clinical cases and 1 death during Epidemiological Week 17. The severe respiratory burden continues to affect several central districts, with Kamuzu Central Hospital (KCH) in Lilongwe reporting 83 cases (77.5% of the national total). This consistent concentration highlights the need for continuous sentinel respiratory surveillance and clinical preparedness within tertiary facilities to handle sudden influxes of acute respiratory cases.

When evaluated against the dramatic respiratory surges experienced during Epidemiological Week 16, the Week 17 data displays a massive and positive reduction. National SARI cases dropped by 64.9%, falling from 305 down to 107 cases. This decline is largely due to the sudden resolution of the localized surge in Dowa (which fell from 144 cases down to zero). At the same time, SARI-associated deaths fell from 2 in Week 16 to 1 in Week 17, indicating that the acute respiratory pressure of the previous week has subsided considerably.

We recommend that clinical teams at Kamuzu Central Hospital and other sentinel hospitals continue to systematically collect nasopharyngeal swabs from SARI patients for PCR diagnostic analysis. Healthcare facilities must ensure that pediatric oxygen delivery systems, clinical nebulizers, and essential respiratory therapeutics remain fully functional. Furthermore, clinicians must continue to document and report SARI cases on the OHSP, allowing public health teams to identify and respond to any new respiratory anomalies quickly.

Detailed Bulletin Analysis

Vaccine-Preventable Disease (VPD) surveillance remains a high-priority public health activity, with cumulative confirmed Measles cases holding at 287 across 23 districts in 2026. This week recorded 42 new Measles alerts, emphasizing the persistent transmission risk in hotspot districts. Under the IDSR framework, Acute Flaccid Paralysis (AFP) surveillance recorded 2 cases, and Meningococcal meningitis recorded 7 cases. At the same time, 2 Neonatal tetanus cases were confirmed, highlighting the need for sustained maternal immunization and safe delivery practices.

When compared to Epidemiological Week 16, the VPD surveillance profile displays a mixed picture. Weekly Measles alerts increased by 75%, rising from 24 cases in Week 16 to 42 in Week 17, showing that transmission risks remain high. Conversely, AFP alerts fell from 7 in Week 16 to 2 in Week 17, representing a return to expected baseline numbers. Meningococcal meningitis remained stable at 7 cases, while Neonatal tetanus increased from zero cases to 2, indicating localized gaps in maternal immunizations.

We recommend that the Expanded Programme on Immunisation (EPI) immediately schedules targeted supplemental immunization activities (SIA) in Balaka and Kasungu where Measles transmission risks are highest. For the 2 reported AFP cases, district coordinators must ensure that dual stool samples are collected and sent to the laboratory under strict cold chain conditions. To address the 2 Neonatal tetanus cases, reproductive health teams must strengthen maternal Tetanus Toxoid (TT) coverage and actively promote institutional, hygienic delivery practices.