Weekly IDSR Bulletin

Detailed Bulletin Analysis

The national reporting performance for Epidemiological Week 20 has achieved a robust trajectory, registering 95.0% for reporting completeness and a highly encouraging 94.0% for reporting timeliness on the One Health Surveillance Platform (OHSP). This commendable performance demonstrates the stable capacity of our national integrated tracking systems to receive and process critical health facility records in a highly timely manner. Across the 33 designated national reporting sites, 29 (87.9%) successfully met the national target of 80% or greater for both completeness and timeliness. This extensive tracking provides the Ministry of Health with real-time situational awareness of priority conditions across the country.

When evaluated against the previous historical baseline in Epidemiological Week 17, which achieved 97.1% completeness and 91.0% timeliness, Week 20 displays a mixed but highly encouraging evolution. Reporting completeness saw a slight decrease of 2.1 percentage points, declining from 97.1% to 95.0%. However, reporting timeliness experienced a significant increase of 3.0 percentage points, rising from 91.0% to 94.0%. This improvement is especially notable given that Central Hospitals—which previously struggled—achieved a timely submission rate of 75.0% and a completeness rate of 100.0%. However, Zomba, Dowa, and Karonga districts failed to reach target thresholds on both indicators, while Mzuzu Central Hospital fell short specifically on the timeliness metric.

To address these remaining gaps and maintain optimal surveillance parameters, the National IDSR Secretariat recommends immediate technical follow-up. Zomba, Dowa, and Karonga DHOs must prioritize targeted administrative interventions to resolve local platform connectivity issues and staff reporting delays. In addition, Zonal Epidemiology Officers must enforce daily data validation procedures immediately after facility-level entry, ensuring that delayed reporting sites are supported to achieve the 100% national target for both completeness and timeliness in the upcoming epidemiological cycles.

Detailed Bulletin Analysis

Malaria remains the most significant priority clinical condition under active surveillance in Malawi, with Epidemiological Week 20 recording an immense burden of 34,625 cases and 8 associated inpatient deaths. This heavy volume of clinical cases indicates high transmission dynamics throughout the country and places constant pressure on primary care facilities, diagnostic laboratories, and essential antimalarial drug inventories. The persistent clinical mortality highlights the critical importance of ensuring early diagnosis, immediate therapeutic initiation, and optimal critical care management within inpatient wards nationwide.

When contrasted with the previous baseline in Epidemiological Week 17, the malaria data reveals a highly concerning upward trajectory in both morbidity and mortality. Total malaria cases rose sharply by 28.4%, surging from 26,959 cases in Week 17 to 34,625 cases in Week 20. Concurrently, confirmed inpatient deaths rose from 6 to 8, representing a 33.3% increase in fatal clinical outcomes. This synchronous climb indicates a expanding vector breeding season or potential gaps in community-level preventative measures (such as bed net usage) and early treatment-seeking behaviors, leading to late clinical presentation with severe complications.

To address this rising trend, the National Malaria Control Program must coordinate immediate antimalarial supply chain audits. We recommend ensuring that all primary health facilities maintain uninterrupted buffer stocks of Rapid Diagnostic Tests (RDTs) and Artemisinin-based Combination Therapy (ACTs). Clinical teams must conduct rigorous mortality audits on all 8 recorded deaths to determine if there were delays in administering intravenous artesunate. Concurrently, Health Surveillance Assistants (HSAs) must intensify community-level risk communication campaigns to emphasize immediate care-seeking behaviors for all febrile illnesses.

Detailed Bulletin Analysis

The surveillance of waterborne enteric pathogens in Epidemiological Week 20 has flagged a significant clinical concern, with Typhoid fever cases recorded at 126 and Bloody Diarrhoea cases totaling 783. Enteric disease transmission remains a persistent threat, particularly in urban and peri-urban locations with compromised water and sanitation systems. To address these threats, the National IDSR recommendations explicitly target several high-reporting districts—specifically Kasungu, Dedza, Blantyre, Lilongwe, and Mchinji—requiring immediate field investigations to identify the contamination sources driving these persistent Typhoid fever clusters.

When compared to the baseline figures from Epidemiological Week 17, both enteric indicators demonstrate a highly concerning escalation in transmission. Typhoid fever cases more than doubled, experiencing an extraordinary 117.2% surge from 58 cases in Week 17 to 126 cases in Week 20. Bloody Diarrhoea cases also followed a highly concerning upward trend, rising by 26.3% from 620 cases to 783 cases. This rapid rise across multiple enteric indicators confirms that waterborne and foodborne pathogens are actively spreading, requiring a swift shift from passive clinical tracking to active environmental health interventions.

Based on these findings, we recommend that Kasungu, Dedza, Blantyre, Lilongwe, and Mchinji DHOs deploy rapid response teams to conduct systematic water quality monitoring and food safety inspections. Stool and blood cultures must be collected from all suspected Typhoid cases to check for potential antibiotic resistance patterns and guide precise clinical therapy. Furthermore, environmental health officers must implement localized water treatment protocols, distribute household water-guard chlorine solution, and conduct extensive hygiene sensitization campaigns in high-density markets and informal settlements to break the transmission chains.

Detailed Bulletin Analysis

Epidemiological Week 20 recorded a highly active Cholera situation, with 145 suspected cases resulting in 84 laboratory-confirmed cholera cases, alongside a commendable zero-death record. This stable 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 detected 2 suspect alerts, but happily, zero (0) new cases were confirmed, keeping the cumulative national total stable at 157 confirmed cases since the outbreak began in April 2025.

A comparison with Epidemiological Week 17 shows that the Cholera outbreak is evolving toward a highly concentrated phase with a much higher laboratory-confirmation rate. While the absolute number of suspected cholera cases declined from 255 in Week 17 to 145 in Week 20 (a 43.1% reduction), the confirmed cholera cases surged dramatically from 25 in Week 17 to 84 in Week 20 (a 236% increase). This massive surge in confirmed cases indicates that transmission is highly concentrated in hotspot districts, particularly Blantyre (180 cumulative cases) and Chikwawa (144 cumulative cases). Concurrently, Mpox alerts rose from zero to 2, though zero new cases were confirmed.

To counter this 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 confirmed cases, the 2 new alerts must be investigated within 24 hours. Cross-border coordination with Mozambique and Tanzania must also be maintained to make sure any imported cases are detected and managed promptly.

Detailed Bulletin Analysis

Severe Acute Respiratory Infections (SARI) presented 166 clinical cases and 2 deaths during Epidemiological Week 20. The severe respiratory burden continues to affect several central districts, with Kamuzu Central Hospital (KCH) in Lilongwe reporting 49 cases and Dowa DHO reporting 41 cases. 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 baseline from Epidemiological Week 17, the SARI surveillance data displays a notable increase in respiratory morbidity and mortality. National SARI cases rose by 55.1%, climbing from 107 cases in Week 17 to 166 cases in Week 20, while SARI-associated deaths increased from 1 to 2. This upward trend in both clinical cases and fatal outcomes suggests the potential circulation of highly contagious seasonal respiratory pathogens, such as Influenza A/B or RSV, requiring immediate diagnostic and clinical attention.

We recommend that clinical teams at Kamuzu Central Hospital, Dowa District 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 rising significantly to 366 across 23 districts in 2026. This week recorded 108 new Measles alerts, emphasizing the persistent transmission risk in hotspot districts, with Balaka reporting the highest proportion at 21.9% (80 cumulative cases). Under the IDSR framework, Acute Flaccid Paralysis (AFP) surveillance recorded 3 cases, and Meningococcal meningitis recorded 7 cases, highlighting the need for sustained immunization coverage and active case searching.

When compared to Epidemiological Week 17, the VPD surveillance profile displays a highly concerning escalation in Measles transmission. Weekly Measles alerts more than doubled, experiencing an extraordinary 157.1% surge from 42 cases in Week 17 to 108 cases in Week 20. The cumulative confirmed Measles cases rose from 287 to 366, showing active transmission across multiple districts. Conversely, weekly AFP alerts remained relatively stable, moving from 2 to 3, which reflects normal baseline surveillance sensitivity, while suspected Meningococcal meningitis cases remained stable at 7.

We recommend that the Expanded Programme on Immunisation (EPI) immediately schedules targeted supplemental immunization activities (SIA) in Balaka and other high-burden districts to interrupt Measles transmission. For the 3 reported AFP cases, district coordinators must ensure that dual stool samples are collected and sent to the laboratory under strict cold chain conditions. To prevent further Measles spread, healthcare facilities must strengthen routine immunization coverage, conduct active case searches in communities, and ensure immediate diagnostic sample collection.