Weekly IDSR Bulletin
Epidemiological Week 39 (21st – 27th September, 2026)
Editorial Team
I. Health System Reporting Performance
1. National Reporting Trend (W28 – W39)
Analytics: This chart illustrates the national IDSR reporting completeness and timeliness trajectory from Epidemiological Week 28 through Week 39. A noticeable decline occurred in the current reporting cycle, with completeness dropping from 95% in Week 38 down to 90%. Timeliness also saw a parallel drop to 90%, though both metrics still hover safely above the 80% national minimum target.
Insights: The concurrent dip in both completeness and timeliness indicates a systemic, albeit likely temporary, disruption in data submission at the health facility level. This decline interrupts a previously steady streak of high performance (regularly hitting 97-98%).
Recommendations: IDSR Coordinators and Zonal Epidemiology Officers must ensure timely verification and validation of data immediately after health facility focal persons or data clerks enter it into the OHSP. Targeted follow-ups are required to reverse this declining trend.
2. Zonal Reporting Rates (Week 39)
Analytics: The bar chart breaks down the reporting rates across the major health zones, including Central Hospitals. Most zones achieved exceptional rates, with Central East, Central West, North, South East, and South West easily surpassing the 80% threshold. However, Central Hospitals struggled specifically with timeliness, recording a low 75%, despite achieving 100% completeness.
Insights: The delay within Central Hospitals suggests structural workflow bottlenecks. While the data is eventually being compiled (100% completeness), the administrative burden, high patient volumes, or slow internal data collation processes are causing critical delays in submission to the national platform.
Recommendations: Direct administrative intervention is required at Central Hospitals (particularly Mzuzu CH) to streamline their reporting pipelines. Dedicating specific personnel solely to timely IDSR data entry, rather than combining it with general clinical duties, may alleviate this lag.
II. Event-Based Surveillance (EBS)
3. Community EBS Signal Verification Status
Analytics: During Week 39, the community surveillance network reported 35 Event-Based Surveillance (EBS) signals across 7 districts. Following investigation, 13 signals (37.1%) were verified as true public health events, 21 signals (60%) could not be verified, and 1 signal (2.8%) was discarded.
Insights: A 60% non-verification rate points to a high volume of “noise” within the community reporting system this week. While a sensitive system is preferred over a restrictive one, investigating unverified signals heavily consumes the time and resources of District Rapid Response Teams (DRRTs).
Recommendations: Community health workers and informants require clearer guidelines and refined case definitions to improve the accuracy of their initial alerts. DRRTs must continue to conduct swift risk assessments for all verified signals without delay to ensure localized events do not escalate.
4. Verified EBS Signals by Risk Level
Analytics: Risk assessments were conducted for the 13 successfully verified events. The distribution reveals that 4 events (31%) were classified as High Risk, 5 events (38%) as Moderate Risk, and 4 events (31%) as Low Risk.
Insights: Having nearly a third (31%) of verified events classified as High Risk is a significant concern, requiring immediate public health mobilization. The prominent categories of alerts included sudden weakness of limbs (AFP alerts) and unexplained bleeding, which historically trigger elevated risk protocols.
Recommendations: DRRTs must prioritize the immediate deployment of field epidemiologists to the 4 high-risk event sites. Continuous monitoring of the moderate-risk events is also necessary to ensure they do not escalate into wider outbreaks.
III. Epidemic Prone & Priority Diseases
5. Priority Disease Alerts (Week 39)
Analytics: This chart visualizes the alerts for priority notifiable conditions. Diarrhoea with blood heavily dominated with 859 cases. This was followed by suspected Measles (113 cases), Adverse Events Following Immunization (AEFI – 99 cases), Typhoid fever (95 cases), Severe Acute Respiratory Infections (SARI – 63 cases, with 3 deaths), and Meningococcal meningitis (5 cases).
Insights: The escalating burden of bloody diarrhoea (859 cases) combined with Typhoid fever points toward severe environmental health failures, likely linked to compromised water sources or deteriorating sanitation ahead of the rainy season.
Recommendations: Mchinji, Lilongwe, and Blantyre DHOs must launch targeted, aggressive interventions against Typhoid and enteric diseases. This should include immediate community water testing, robust WASH campaigns, and the distribution of water treatment supplies in heavily affected catchments.
6. Measles Outbreak: Cumulative Cases by District
Analytics: Localized measles outbreaks continue across several districts in 2026. Nsanje leads with 499 cumulative cases, closely followed by Balaka (494), Chikwawa (387), Dedza (375), and Mulanje (67). Over 85% of confirmed cases have occurred in children under 15 years old.
Insights: Over 70% of these cases are among individuals who are unvaccinated or have an unknown vaccination status. The persistent outbreaks in places like Nsanje, Balaka, and Dedza highlight deep-rooted immunity gaps and an accumulation of susceptible pediatric cohorts that routine systems have failed to capture.
Recommendations: The Expanded Programme on Immunisation (EPI) must strengthen routine immunization coverage and adapt outreach strategies to immediately close immunity gaps. Active case searching must continue in localized hotspot catchment areas like Ngabu, Ndamera, and Kalembo.
IV. System Challenges & Interventions
7. Polio Vaccination Campaign Coverage
Analytics: Following the detection of cVDPV2, Malawi has executed intensive nOPV2 vaccination rounds. Round 1 achieved 103% coverage (6.22M vaccinated); Round 2 hit 106% (6.63M); Round 3 reached 105% (7.06M); and the recent Round 4 (August 11-14) achieved 103% (7.29M vaccinated).
Insights: Consistently surpassing 100% administrative coverage proves the campaigns are successfully capturing highly transient populations, cross-border children, and unregistered demographics. This aggressive saturation strategy is vital to eradicating circulating vaccine-derived poliovirus type 2.
Recommendations: Advocacy and coordination with MoH leadership and partners must continue as the National Emergency Operations Centre (EOC) transitions from emergency campaign mode to strengthening highly sensitive Acute Flaccid Paralysis (AFP) surveillance nationwide.
8. Underperforming Districts (Week 39)
Analytics: While the national average dropped to 90% for both completeness and timeliness, specific districts performed exceptionally poorly. Karonga DHO managed only 67% on both metrics. Likoma DHO fell to critical levels with 39% completeness and 33% timeliness. Mzuzu Central Hospital registered 0% for timeliness.
Insights: The severe collapse in reporting from Likoma and Mzuzu Central Hospital indicates total hardware/connectivity failure, or a complete absence of personnel assigned to OHSP data entry during Week 39. These specific failures heavily skewed the national average downward.
Recommendations: Karonga, Likoma, Zomba DHO, and Mzuzu Central Hospital must immediately improve on both the timeliness and completeness of their reports. Zonal supervisors should initiate direct contact with these facilities to resolve connectivity or staffing bottlenecks.
V. Targeted District & Facility Recommendations
1. Immediate Data Compliance Overhaul
Karonga, Likoma, Zomba DHO, and Mzuzu Central Hospital must implement immediate corrective measures to elevate their reporting metrics back above the 80% threshold. IDSR Coordinators must ensure verification happens synchronously with facility-level entry.
2. Typhoid & Enteric Disease Containment
Mchinji, Lilongwe, and Blantyre DHOs are directed to launch aggressive, targeted WASH interventions against the rising tide of Typhoid and bloody diarrhoea. This must include immediate community water source testing and strict sanitation enforcement.
3. Outbreak Response & Immunization
All District Rapid Response Teams (DRRTs) must eliminate delays in conducting field risk assessments for verified community signals. The Expanded Programme on Immunisation (EPI) must drastically strengthen routine immunization coverage to close the pediatric immunity gaps driving localized Measles outbreaks.