How many dengue cases does Vietnam have per year?

Vietnam reports 100,000–200,000 dengue cases annually with actual burden estimated much higher. Ho Chi Minh City and the Mekong Delta account for the majority of cases. Year-round transmission occurs in the south; northern Vietnam peaks July-October.

Is Ho Chi Minh City a dengue hotspot?

Yes. Ho Chi Minh City (Saigon) is Vietnam's dengue epicenter, with year-round transmission driven by the tropical climate, dense urban population, and Aedes aegypti breeding in urban water storage and containers. The city reports the highest dengue case counts in Vietnam year after year.

Is dengue a risk for tourists in Vietnam?

Yes, dengue is a real risk throughout Vietnam, particularly in the south and during the rainy season. Use DEET repellent during daytime hours, wear protective clothing, and seek medical care for any fever. Good hospitals with dengue protocols exist in Hanoi, Ho Chi Minh City, and Da Nang.

VietnamDengueSoutheast Asia

Dengue Fever in Vietnam

Vietnam consistently ranks among Southeast Asia's highest dengue burden countries — with Ho Chi Minh City as the regional epicenter for transmission.

VirusWatch Editorial Team — Last reviewed: May 2025

Medical Disclaimer: For dengue fever: paracetamol only — NOT ibuprofen. Not medical advice. VirusWatch is an independent website. We are not affiliated with, endorsed by, or connected to WHO, CDC, ECDC, PAHO, or any government health agency. Content is not medically reviewed.

Key Data

Metric	Data
Annual cases (reported)	100,000–200,000
Peak season (South)	Year-round; peak May–November
Peak season (North)	July–October
Highest-burden areas	Ho Chi Minh City, Mekong Delta, Central Coast
Serotypes	All 4 (DENV 1–4)

North vs. South Vietnam: Different Patterns

Vietnam's dengue epidemiology differs significantly between the tropical south (HCMC, Mekong Delta) and the subtropical north (Hanoi, Red River Delta). The south experiences year-round transmission with a pronounced rainy season peak. The north has a more defined seasonal pattern (July–October), with cooler winters limiting Aedes activity. The Mekong Delta — with its extensive waterways and water storage — creates ideal year-round Aedes breeding habitat.

Vietnam's Research Contribution

Vietnamese researchers at the Hospital for Tropical Diseases (HCMC) and Oxford University Clinical Research Unit (OUCRU) have made landmark contributions to dengue science — including studies on dengue pathophysiology, the timing of plasma leakage, and the optimization of fluid resuscitation in dengue shock syndrome. Vietnam is one of the world's leading sites for dengue clinical research.

Seasonal Risk Calendar: When and Where to Be Most Alert

Vietnam's north-south geography and climate differences create distinct dengue seasonal patterns that travelers should understand before planning trips:

Region	Peak Season	Lower Risk Period	Key Cities
Southern Vietnam	May–November	December–March	Ho Chi Minh City, Can Tho, Mekong Delta
Central Vietnam	August–November	January–April	Da Nang, Hoi An, Hue
Northern Vietnam	July–October	November–March (cooler)	Hanoi, Hai Phong

Southern Vietnam's tropical climate means dengue risk is genuinely year-round in Ho Chi Minh City and the Mekong Delta, with only a modest reduction during the dry season (December–April). Da Nang — a major beach destination — peaks later in the year than the south, corresponding to its September–November rainy season. Hanoi's cooler winters (temperatures regularly dropping below 18°C) suppress Aedes breeding, making October–November–December the transition out of the northern dengue season.

Hospital access: Ho Chi Minh City's Hospital for Tropical Diseases (Bệnh viện Bệnh Nhiệt Đới) is one of Southeast Asia's leading dengue treatment centers and a global research hub. Hanoi's National Hospital of Tropical Diseases provides equivalent expertise in the north. Private options include FV Hospital (HCMC) and Vinmec International Hospital (Hanoi) with English-speaking staff.

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FAQ

Yes. Ho Chi Minh City has year-round dengue transmission and consistently reports the highest case counts in Vietnam. The tropical climate, dense urban population, and water storage practices create ideal Aedes breeding conditions. Use DEET and long clothing during daytime.

Dengue risk exists in Hanoi, particularly from July to October, but is generally lower than in southern Vietnam due to cooler winter temperatures limiting Aedes activity. The risk spikes during outbreak years — 2017 saw a major Hanoi dengue outbreak.

Sources: Vietnam Ministry of Health; WHO WPRO Vietnam dengue; OUCRU Hanoi/HCMC research; Lancet Infectious Diseases Vietnam dengue studies.