Asia-Pacific Regional Summary
Report Date: November 2, 2025 | Updated: December 10, 2025
Latest Data Update: Dashboard updated with December 2025 data from WHO SEARO, official health ministries, and international surveillance systems. Country data ranges from late October to early December 2025.
DENGUE, CHIKUNGUNYA, AND ZIKA IN ASIA-PACIFIC
Global Context for Asia
Asia-Pacific continues to experience unprecedented mosquito-borne disease activity in 2025. The region accounts for a significant portion of global dengue cases (estimated 1.5+ million), is the epicenter of emerging chikungunya outbreaks (445,271 suspected/confirmed cases globally Jan-Sept, 155 deaths), and continues surveillance for Zika expansion. The combination of monsoon patterns, urbanization, and climate variability has created ideal conditions for Aedes vector proliferation across the region.
Global 2025 Summary (as of December):
• Dengue: 4+ million cases globally, 2,500-3,000 deaths
• Chikungunya: 445,271 suspected/confirmed cases (Jan-Sept), 155 deaths, 40 countries affected
• Zika: 25,800+ cases in Americas; minimal activity in Asia-Pacific
• CDC Travel Advisories: Level 2 notices issued for Bangladesh, Sri Lanka, China (Guangdong), Cuba
BANGLADESH
Last Updated: October 6, 2025
DENGUE:
• Total Cases 2025: 33,800+ cases (as of late September/early October)
• Deaths: 215 deaths (as of October 6, 2025)
• Comparison to 2024: 312% increase in cases - severe outbreak
• Primary Affected Areas: Dhaka, Chattogram
• Status: Ongoing dual crisis with chikungunya
• Total Cases 2025: 33,800+ cases (as of late September/early October)
• Deaths: 215 deaths (as of October 6, 2025)
• Comparison to 2024: 312% increase in cases - severe outbreak
• Primary Affected Areas: Dhaka, Chattogram
• Status: Ongoing dual crisis with chikungunya
CHIKUNGUNYA:
• Confirmed Cases: 732 suspected cases (Jan-Aug 31, 2025), 400 lab-confirmed in Dhaka
• CDC Travel Health Notice: Level 2 (as of Dec 9, 2025)
• Status: Active outbreak, dual threat with dengue
• Confirmed Cases: 732 suspected cases (Jan-Aug 31, 2025), 400 lab-confirmed in Dhaka
• CDC Travel Health Notice: Level 2 (as of Dec 9, 2025)
• Status: Active outbreak, dual threat with dengue
ZIKA:
• Confirmed Cases: 11 cases detected (predominantly among dengue patients)
• Status: Emerging threat, under surveillance
• Confirmed Cases: 11 cases detected (predominantly among dengue patients)
• Status: Emerging threat, under surveillance
Combined 2025 Burden (Bangladesh): 34,543+ total cases (33,800 dengue + 732 chikungunya + 11 zika)
Public Health Response: Enhanced surveillance systems activated, vector control intensified in major urban centers.
Data Verification Sources:
- WHO South-East Asia Region (SEARO)
- Bangladesh Institute of Epidemiology, Disease Control and Research (IEDCR)
- Dhaka City Corporation Health Office
- CDC Health Alert - Bangladesh (Level 2 Travel Advisory, December 2025)
- IANS, TBS News, Ministry of Health & Family Welfare
CAMBODIA
Last Updated: October 2025
DENGUE:
• Total Cases: 32,803 cases reported
• Deaths: 52 dengue-related deaths
• Status: Active surveillance ongoing
• Total Cases: 32,803 cases reported
• Deaths: 52 dengue-related deaths
• Status: Active surveillance ongoing
CHIKUNGUNYA & ZIKA:
• Status: Under surveillance
• Status: Under surveillance
Data Verification Sources:
- WHO South-East Asia Region (SEARO)
- Cambodia Ministry of Health
- National Vector Borne Disease Control Centre (NVBDCC)
CHINA (Guangdong Province)
Last Updated: October 22, 2025
DENGUE:
• Status: Seasonal dengue cases during monsoon period
• Cases: Under surveillance, declining trend expected post-monsoon
• Status: Seasonal dengue cases during monsoon period
• Cases: Under surveillance, declining trend expected post-monsoon
CHIKUNGUNYA - MAJOR OUTBREAK:
• Total Confirmed Cases: 16,452 cases (as of Sept 27, 2025) - LARGEST OUTBREAK IN CHINA HISTORY
• Outbreak Start: July 2025 in Foshan
• Geographic Epicenter: Foshan, Guangdong Province
• Case Distribution:
- Foshan: 3,600+ cases (initial epicenter)
- Guangzhou: Active transmission
- Shenzhen: Cases reported
- Other Guangdong cities: Ongoing surveillance
• Viral Characteristics: Asian lineage chikungunya
• CDC Travel Alert: Issue Dec 5, 2025
• Significance: First major temperate region outbreak of this scale, indicates potential for geographic expansion
• Total Confirmed Cases: 16,452 cases (as of Sept 27, 2025) - LARGEST OUTBREAK IN CHINA HISTORY
• Outbreak Start: July 2025 in Foshan
• Geographic Epicenter: Foshan, Guangdong Province
• Case Distribution:
- Foshan: 3,600+ cases (initial epicenter)
- Guangzhou: Active transmission
- Shenzhen: Cases reported
- Other Guangdong cities: Ongoing surveillance
• Viral Characteristics: Asian lineage chikungunya
• CDC Travel Alert: Issue Dec 5, 2025
• Significance: First major temperate region outbreak of this scale, indicates potential for geographic expansion
ZIKA:
• Status: No cases reported in 2025
• Status: No cases reported in 2025
Combined 2025 Burden (China/Guangdong): 16,452+ cases (16,452 chikungunya; dengue under seasonal surveillance; no zika)
Public Health Response: Intensive mosquito control efforts active, ongoing epidemiological investigation, enhanced surveillance in neighboring provinces.
Data Verification Sources:
- China National Health Commission (NHC) - Guangdong Province
- Guangdong Center for Disease Control and Prevention (CDC Guangdong)
- CDC Travel Advisory - China/Guangdong (Level 2, December 5, 2025)
- WHO Western Pacific Region Office
- Science Daily, China Daily, ScienceDirect, Outbreak News Today
INDIA
Last Updated: October-November 2025
DENGUE:
• Status: Cases reported across multiple states
• Active surveillance maintained by NCVBDC
• Status: Cases reported across multiple states
• Active surveillance maintained by NCVBDC
CHIKUNGUNYA - MAJOR OUTBREAK:
• Total Cases: >34,628 confirmed cases (as of November 2025)
• Geographic Distribution: Multiple states affected, particularly areas conducive to vector transmission
• Status: Ongoing outbreak with localized surges
• Significance: India remains the major chikungunya burden in the WHO South-East Asia region
• Total Cases: >34,628 confirmed cases (as of November 2025)
• Geographic Distribution: Multiple states affected, particularly areas conducive to vector transmission
• Status: Ongoing outbreak with localized surges
• Significance: India remains the major chikungunya burden in the WHO South-East Asia region
ZIKA:
• Status: Under surveillance
• Status: Under surveillance
Public Health Response: Enhanced surveillance and control measures, community awareness programs, healthcare provider training.
Data Verification Sources:
- WHO South-East Asia Region (SEARO)
- India's National Centre for Vector Borne Disease Control (NCVBDC)
- Indian Council of Medical Research (ICMR)
- Ministry of Health & Family Welfare, Government of India
- European Centre for Disease Prevention and Control (ECDC)
INDONESIA
Last Updated: Mid-2025
DENGUE:
• Total Cases: 67,000+ dengue cases (as of mid-2025)
• Deaths: 297 dengue-related deaths
• Trend: High transmission across multiple provinces
• Primary Affected Areas: Jawa Barat, Jawa Tengah, Jawa Timur (Java region)
• Status: Significant outbreak with high mortality rate
• Total Cases: 67,000+ dengue cases (as of mid-2025)
• Deaths: 297 dengue-related deaths
• Trend: High transmission across multiple provinces
• Primary Affected Areas: Jawa Barat, Jawa Tengah, Jawa Timur (Java region)
• Status: Significant outbreak with high mortality rate
CHIKUNGUNYA:
• Confirmed Cases: 3,608 confirmed cases (as of July 31, 2025) across 19 provinces
• Deaths: None recorded to date
• Comparison to 2024: Higher than 1,399 confirmed cases (same period 2024)
• Geographic Distribution: Nationwide, primarily in Java region
• Status: Major resurgence after years of lower activity
• Confirmed Cases: 3,608 confirmed cases (as of July 31, 2025) across 19 provinces
• Deaths: None recorded to date
• Comparison to 2024: Higher than 1,399 confirmed cases (same period 2024)
• Geographic Distribution: Nationwide, primarily in Java region
• Status: Major resurgence after years of lower activity
ZIKA:
• Status: Under surveillance, no active outbreak reported
• Status: Under surveillance, no active outbreak reported
Combined 2025 Burden (Indonesia): 70,608+ total cases (67,000 dengue + 3,608 chikungunya confirmed)
Strategic Initiative: Indonesia targets zero dengue deaths by 2030 through comprehensive health system transformation. Currently implements integrated vector management across provinces.
Data Verification Sources:
- Indonesia Ministry of Health (Kementerian Kesehatan)
- WHO South-East Asia Region (SEARO)
- Indonesian CDC (Pusat Pengendalian dan Pencegahan Penyakit)
- The Jakarta Post, Regional Health Ministry Reports
LAOS
Last Updated: August 5, 2025
DENGUE:
• Total Cases: 5,615 dengue cases reported
• Deaths: 1 death
• Geographic Concentration: Vientiane accounting for nearly 50% of cases
• Trend: Significant improvement - 556 cases only in Jan-March period vs historical patterns
• Total Cases: 5,615 dengue cases reported
• Deaths: 1 death
• Geographic Concentration: Vientiane accounting for nearly 50% of cases
• Trend: Significant improvement - 556 cases only in Jan-March period vs historical patterns
CHIKUNGUNYA & ZIKA:
• Status: Under surveillance, no reports
• Status: Under surveillance, no reports
Data Verification Sources:
- WHO South-East Asia Region (SEARO)
- Lao Ministry of Health
- National Center for Laboratory and Epidemiology (NCLE), Laos
MALDIVES
Last Updated: April 30, 2025
DENGUE:
• Total Cases: 347 cases (as of April 30, 2025)
• Comparison: Down from 641 cases in same period 2024
• Trend: Decreasing
• Total Cases: 347 cases (as of April 30, 2025)
• Comparison: Down from 641 cases in same period 2024
• Trend: Decreasing
CHIKUNGUNYA:
• Total Cases: 78 confirmed cases
• Total Cases: 78 confirmed cases
ZIKA:
• Status: No reports
• Status: No reports
Data Verification Sources:
- WHO South-East Asia Region (SEARO)
- Maldives Ministry of Health
- National Health Laboratory, Maldives
MALAYSIA
Last Updated: July 5, 2025
DENGUE:
• Total Cases: 32,299 dengue cases (January 1 - July 5, 2025)
• Deaths: 21 fatalities
• Trend: 58.6% DECREASE compared to same period 2024 - significant improvement
• Status: Positive trend in outbreak control
• Total Cases: 32,299 dengue cases (January 1 - July 5, 2025)
• Deaths: 21 fatalities
• Trend: 58.6% DECREASE compared to same period 2024 - significant improvement
• Status: Positive trend in outbreak control
CHIKUNGUNYA:
• Status: Sporadic cases only, no major outbreak
• Status: Sporadic cases only, no major outbreak
ZIKA:
• Status: Not reported
• Status: Not reported
Data Verification Sources:
- WHO South-East Asia Region (SEARO)
- Malaysia Ministry of Health (Kementerian Kesihatan)
- Disease Control Division, Malaysia
NEPAL
Last Updated: July 31, 2025
DENGUE:
• Total Cases: 2,587 cases (as of July 31, 2025)
• Comparison: Significantly lower than 4,777 cases in same period 2024
• Trend: Declining year-over-year
• Total Cases: 2,587 cases (as of July 31, 2025)
• Comparison: Significantly lower than 4,777 cases in same period 2024
• Trend: Declining year-over-year
CHIKUNGUNYA & ZIKA:
• Status: No confirmed outbreaks
• Status: No confirmed outbreaks
Data Verification Sources:
- WHO South-East Asia Region (SEARO)
- Nepal Ministry of Health & Population
- Epidemiology & Disease Control Division (EDCD), Nepal
PHILIPPINES
Last Updated: December 4, 2025 (Latest - Quezon City)
DENGUE:
• National Total (as of Nov 2): 140,000+ dengue cases in 2025
• Deaths (Nov 2): 437 dengue-related deaths
• Quezon City Update (Dec 4, 2025): 8,729 cases with 46 deaths (91% increase vs 2024)
• Quezon City Trend: Cases up 40% in major urban centers as of December
• Peak Activity: July-October 2025, continuing into December
• Geographic Distribution: Widespread across multiple regions; Quezon City particularly affected
• Overall Trend: 40-75% increase vs 2024 - Severe and persistent outbreak
• National Total (as of Nov 2): 140,000+ dengue cases in 2025
• Deaths (Nov 2): 437 dengue-related deaths
• Quezon City Update (Dec 4, 2025): 8,729 cases with 46 deaths (91% increase vs 2024)
• Quezon City Trend: Cases up 40% in major urban centers as of December
• Peak Activity: July-October 2025, continuing into December
• Geographic Distribution: Widespread across multiple regions; Quezon City particularly affected
• Overall Trend: 40-75% increase vs 2024 - Severe and persistent outbreak
CHIKUNGUNYA:
• Confirmed Cases: 628 cases (as of Aug 16, 2025)
• Trend: 78% DECREASE from 2,886 cases (same period 2024)
• Status: Well-controlled compared to dengue burden
• Confirmed Cases: 628 cases (as of Aug 16, 2025)
• Trend: 78% DECREASE from 2,886 cases (same period 2024)
• Status: Well-controlled compared to dengue burden
ZIKA:
• Status: No reports in 2025
• Status: No reports in 2025
Combined 2025 Burden (Philippines): 140,628+ total cases (140,000 dengue + 628 chikungunya)
Public Health Response: Department of Health (DOH) coordinating enhanced surveillance, vector control programs, and hospital preparedness across all regions.
Data Verification Sources:
- Department of Health (DOH), Philippines
- WHO South-East Asia Region (SEARO)
- Quezon City Health Department
- CDC Disease Intelligence
- Rappler, Philstar.com, GMA News, Local Media Reports
SINGAPORE
Last Updated: August 15, 2025
DENGUE:
• Total Cases: 3,122 dengue cases (January-August 2025)
• Dominant Serotype: DENV-2 (circulating since 2023)
• Status: Controlled transmission through active surveillance
• Notable Initiative: Project Wolbachia showing positive impact on transmission reduction
• Total Cases: 3,122 dengue cases (January-August 2025)
• Dominant Serotype: DENV-2 (circulating since 2023)
• Status: Controlled transmission through active surveillance
• Notable Initiative: Project Wolbachia showing positive impact on transmission reduction
CHIKUNGUNYA:
• Total Cases: 21 cases (as of Aug 28, 2025)
• Trend: >30% increase from 15 cases (all of 2024)
• Rise Period: Started May 2025
• Status: Increasing trend, attributed to mosquito vectors and imported cases
• Total Cases: 21 cases (as of Aug 28, 2025)
• Trend: >30% increase from 15 cases (all of 2024)
• Rise Period: Started May 2025
• Status: Increasing trend, attributed to mosquito vectors and imported cases
ZIKA:
• Total Cases: 11 confirmed cases (as of mid-July 2025)
• Notable: 2 locally-acquired cases confirmed (Woodlands Street 11 & 32)
• Recent Activity: No new cases since March 4, 2025
• Status: Ongoing surveillance; virus signals detected in mosquito samples
• Total Cases: 11 confirmed cases (as of mid-July 2025)
• Notable: 2 locally-acquired cases confirmed (Woodlands Street 11 & 32)
• Recent Activity: No new cases since March 4, 2025
• Status: Ongoing surveillance; virus signals detected in mosquito samples
Combined 2025 Burden (Singapore): 3,154+ total cases (3,122 dengue + 21 chikungunya + 11 zika)
Public Health Strength: Singapore maintains robust surveillance systems and rapid response capabilities. Project Wolbachia-infected mosquitoes continue demonstrating efficacy in dengue suppression.
Data Verification Sources:
- Singapore Ministry of Health (MOH)
- Communicable Diseases Division, Singapore
- National Environment Agency (NEA)
- Project Wolbachia, National University of Singapore
- WHO South-East Asia Region (SEARO)
SRI LANKA
Last Updated: July 2025
DENGUE:
• Total Cases: 33,796 cases (Week 1-30, 2025)
• Comparison: Slightly higher than 2024 (32,301 cases), lower than 2023 (56,227)
• Status: Stable to increasing transmission
• Total Cases: 33,796 cases (Week 1-30, 2025)
• Comparison: Slightly higher than 2024 (32,301 cases), lower than 2023 (56,227)
• Status: Stable to increasing transmission
CHIKUNGUNYA - MAJOR OUTBREAK:
• Status: LARGEST OUTBREAK IN 20 YEARS (since ~2005)
• Timeline: Initiated in late 2024, continuing through 2025
• Viral Lineage: Indian Ocean Lineage (IOL) with unique mutations
• Key Scientific Finding: Genomic sequencing reveals mutations that enhance transmission efficiency via Aedes aegypti mosquitoes
• Significance: IOL variant with enhanced virulence potential represents new epidemiological threat
• Status: LARGEST OUTBREAK IN 20 YEARS (since ~2005)
• Timeline: Initiated in late 2024, continuing through 2025
• Viral Lineage: Indian Ocean Lineage (IOL) with unique mutations
• Key Scientific Finding: Genomic sequencing reveals mutations that enhance transmission efficiency via Aedes aegypti mosquitoes
• Significance: IOL variant with enhanced virulence potential represents new epidemiological threat
ZIKA:
• Status: No cases reported
• Status: No cases reported
Clinical & Scientific Response: Complete genomic characterization completed. Enhanced surveillance for long-term complications including chronic arthralgia monitoring.
Data Verification Sources:
- Sri Lanka Ministry of Health & Wellness
- WHO South-East Asia Region (SEARO)
- National Epidemiology Unit, Sri Lanka
- CDC Travel Advisory - Sri Lanka (Level 2)
- Colombo Municipal Council Health Division
THAILAND
Last Updated: October 31, 2025 (WHO SEARO)
DENGUE:
• Total Cases 2025 (as of Oct 31): 51,795 dengue cases
• Deaths: 46 dengue-related deaths (as of October 31, 2025)
• Previous baseline (July 31): 35,359 cases, 34 deaths
• Comparison to 2024: 63% of cases from same period (July 31 baseline)
• Trend: Higher overall cases than mid-year projections; continued transmission
• Total Cases 2025 (as of Oct 31): 51,795 dengue cases
• Deaths: 46 dengue-related deaths (as of October 31, 2025)
• Previous baseline (July 31): 35,359 cases, 34 deaths
• Comparison to 2024: 63% of cases from same period (July 31 baseline)
• Trend: Higher overall cases than mid-year projections; continued transmission
CHIKUNGUNYA:
• Total Cases: 1,128 cases (Jan-Sept 14, 2025)
• Geographic Distribution: Primarily southern Thailand, but expanding
• Status: Emerging threat, increased surveillance needed
• Total Cases: 1,128 cases (Jan-Sept 14, 2025)
• Geographic Distribution: Primarily southern Thailand, but expanding
• Status: Emerging threat, increased surveillance needed
ZIKA:
• Total Cases: 433 cases with 6 deaths (Jan 2024-Feb 7, 2025), 7 cases (as of July 2025)
• Geographic Spread: 46 provinces affected
• Status: Ongoing circulation, under active surveillance
• Total Cases: 433 cases with 6 deaths (Jan 2024-Feb 7, 2025), 7 cases (as of July 2025)
• Geographic Spread: 46 provinces affected
• Status: Ongoing circulation, under active surveillance
Combined 2025 Burden (Thailand): 53,961+ total cases (51,795 dengue + 1,128 chikungunya + 1,040 zika accumulated)
Public Health Achievement: Thailand demonstrates strong surveillance capabilities. Vector control measures ongoing across all three arboviral diseases.
Data Verification Sources:
- WHO South-East Asia Region (SEARO) - Primary Source
- Thailand Ministry of Public Health (MOPH)
- Department of Disease Control (DDC), Thailand
- Provincial Public Health Offices
- CDC Global Health Alerts
VIETNAM
Last Updated: October 2025 (Official Ministry of Health)
DENGUE - SIGNIFICANT 2025 SURGE:
• National Total (Jan-Oct 2025): 110,503 dengue cases - 16.8% increase vs 2024
• Deaths: 23 deaths reported (Jan-Oct 2025)
• Regional Distribution: Southern region accounts for over 76% of nationwide infections
• Previous Report (Sept 4): 65,000+ cases nationally, 25,000+ in Ho Chi Minh City
• Peak Activity: August-October 2025 (Ho Chi Minh City spike of 2,517 cases in August week)
• Clinical Severity: Increasing reports of severe dengue among children and adults
• Trend: Sustained high transmission continuing through October
• National Total (Jan-Oct 2025): 110,503 dengue cases - 16.8% increase vs 2024
• Deaths: 23 deaths reported (Jan-Oct 2025)
• Regional Distribution: Southern region accounts for over 76% of nationwide infections
• Previous Report (Sept 4): 65,000+ cases nationally, 25,000+ in Ho Chi Minh City
• Peak Activity: August-October 2025 (Ho Chi Minh City spike of 2,517 cases in August week)
• Clinical Severity: Increasing reports of severe dengue among children and adults
• Trend: Sustained high transmission continuing through October
CHIKUNGUNYA:
• Status: Under surveillance, no major outbreak reported
• Activity: Sporadic cases only
• Status: Under surveillance, no major outbreak reported
• Activity: Sporadic cases only
ZIKA:
• Status: Under surveillance
• Activity: Minimal reported activity
• Status: Under surveillance
• Activity: Minimal reported activity
Combined 2025 Burden (Vietnam): 110,503+ total cases (110,503 dengue; chikungunya and zika under surveillance with minimal transmission)
Public Health Response: Vietnam Ministry of Health coordinating prevention campaigns, vaccination efforts, and outbreak management. WHO SEARO providing technical support for response.
Data Verification Sources:
- Vietnam Ministry of Health (Bộ Y tế)
- WHO South-East Asia Region (SEARO) - Primary Source
- Ho Chi Minh City Center for Disease Control (HCDC)
- Vietnam News Agency (VNA), Vietnam Ministry of Health Reports
- CDC Global Disease Intelligence
ASIA-PACIFIC COUNTRY DISEASE BURDEN SUMMARY (2025)
| Country | Dengue Cases | Chikungunya Cases | Zika Cases | TOTAL CASES | Latest Data |
|---|---|---|---|---|---|
| Bangladesh | 33,800+ | 732 | 11 | 34,543+ | Oct 31, 2025 |
| Cambodia | 32,803 | — | — | 32,803+ | Oct 2025 |
| China (Guangdong) | Seasonal | 16,452 | 0 | 16,452+ | Sep 27, 2025 |
| India | Multiple states | 34,628+ | — | 34,628+ | Nov 2025 |
| Indonesia | 67,000+ | 3,608 | — | 70,608+ | Jul 31, 2025 |
| Laos | 5,615 | — | — | 5,615+ | Aug 5, 2025 |
| Maldives | 347 | 78 | — | 425+ | Apr 30, 2025 |
| Malaysia | 32,299 | Sporadic | — | 32,299+ | Jul 5, 2025 |
| Nepal | 2,587 | — | — | 2,587+ | Jul 31, 2025 |
| Philippines | 140,000+ | 628 | — | 140,628+ | Dec 4, 2025 |
| Singapore | 3,122 | 21 | 11 | 3,154+ | Aug 28, 2025 |
| Sri Lanka | 33,796 | Outbreak* | — | 33,796+ | Jul 2025 |
| Thailand | 51,795 | 1,128 | 440 | 53,363+ | Oct 31, 2025 |
| Vietnam | 110,503 | Sporadic | — | 110,503+ | Oct 31, 2025 |
| ASIA-PACIFIC TOTAL | 545,668+ | 57,688+ | 462+ | 603,818+ | Mixed 2025 |
* Sri Lanka chikungunya outbreak: Largest in 20 years with Indian Ocean Lineage (IOL) variant
Table data reflects latest available figures from each country's most recent surveillance reports
"—" indicates no reported cases or surveillance data unavailable
REGIONAL EPIDEMIOLOGICAL OVERVIEW
Critical Developments in Asia-Pacific 2025:
1. CHINA'S HISTORIC CHIKUNGUNYA OUTBREAK (16,000+ cases)
• First major temperate region outbreak of this scale globally
• Guangdong Province epicenter with documented cases in major cities
• Represents potential for disease expansion to new geographic areas
• Epidemiological significance: Challenges historical understanding of chikungunya geographic limitations
2. SRI LANKA'S LARGEST CHIKUNGUNYA OUTBREAK IN 20 YEARS
• Indian Ocean Lineage (IOL) with novel mutations detected
• Genomic characterization reveals enhanced Aedes aegypti transmission efficiency
• Sustained transmission continuing into 2025
• Regional concern: IOL variant potential spread to Indian Ocean territories
3. SOUTH ASIA DUAL MOSQUITO-BORNE DISEASE CRISIS
• Bangladesh: 33,800+ dengue cases + 785+ chikungunya concurrent outbreak
• India: 34,628+ chikungunya cases with ongoing dengue transmission
• Pakistan: Chikungunya surge reported in Karachi region
• Complex epidemiology: Multiple diseases competing for surveillance and resources
4. SOUTHEAST ASIA SURGE - MULTI-COUNTRY ACTIVITY
• Philippines: 140,000+ dengue cases with 437 deaths + 2,854+ chikungunya
• Vietnam: Sharp autumn/winter surge with 25,000+ cases in Ho Chi Minh City
• Indonesia: 67,000+ dengue cases + 20,000+ chikungunya cases
• Combined burden: Over 227,000 cases in three major countries alone
5. VIRAL STRAIN EVOLUTION
• DENV-2: Dominant serotype in multiple countries (Singapore, regional spread)
• Indian Ocean Lineage (IOL): Enhanced transmission chikungunya in Sri Lanka, Indian Ocean
• Asian Lineage: New chikungunya outbreak in China (Guangdong)
• Scientific concern: Genetic changes may alter transmission dynamics
Positive Developments:
• Malaysia: 58.6% decrease in dengue cases - successful control measures
• Thailand: Declining dengue trend with improved case management
• Singapore: Project Wolbachia demonstrating measurable impact on dengue suppression
• Nepal: Year-over-year decline in dengue cases
• Laos: Significant improvement in early season case trends
Key Risk Factors for Asia-Pacific:
⚠ Monsoon patterns continuing to drive vector proliferation
⚠ Climate anomalies (La Niña effects) increasing rainfall
⚠ High viral circulation established across multiple countries
⚠ Vector populations at elevated levels in urban areas
⚠ International travel facilitating disease dissemination
⚠ Variable surveillance capacity across countries
PUBLIC HEALTH INITIATIVES IN ASIA
Vector Control: Intensive mosquito surveillance and control programs across all countries
Surveillance Enhancement: Real-time monitoring systems improving in most countries
Strategic Initiatives:
• Indonesia: Zero dengue deaths by 2030 program
• Singapore: Project Wolbachia - Wolbachia-infected mosquito releases
• Regional: Enhanced cross-border surveillance coordination through WHO SEARO
Data sources: WHO, WHO SEARO, WHO WPRO, CDC, ECDC, ProMED, National Health Authorities; Last updated 02/11/2025 (revised 10/12/2025)
Data Freshness Summary (December 10, 2025)
Most Recently Updated Countries:
✓ Philippines - Dec 4, 2025 (Quezon City health authority)
✓ Vietnam - Oct 31, 2025 (Official Ministry of Health, Jan-Oct data)
✓ Thailand - Oct 31, 2025 (WHO SEARO Epidemiological Bulletin)
Previously Reported (Nov 2, 2025 baseline):
• Bangladesh, China, India, Indonesia, Laos, Maldives, Malaysia, Nepal, Singapore, Sri Lanka, Cambodia
Note: Dashboard contains mixed-date data from official health sources. Thailand figures significantly revised upward with latest WHO SEARO data showing 51,795 total cases (Oct 31) versus 35,359 cases (July 31 baseline). Vietnam confirmed 110,503 cases for Jan-Oct period, substantially higher than September projections.
Latest News & Media Coverage
Most recent updates from global health organizations and news sources
Table displays latest 15 media releases. For complete archive of 48 unique articles (2022-2025), see the News & Events page.