Hanoi has reported a significant increase in dengue fever cases over the past week, with 486 new infections recorded between October 24 and 31. This marks an increase of 94 cases compared with the previous week, according to the Vietnam News Agency.
Data from the Hanoi Centre for Disease Control (CDC) shows that new outbreaks have been detected in 23 communes and wards, raising the total number of active clusters to 32. No fatalities have occurred so far.
Since the beginning of 2025, the capital has documented 4,388 dengue infections. This figure is 20 per cent lower than the number recorded during the same period last year.
Health officials have warned that mosquito density and infection rates in outbreak areas remain high. They said this increases the risk of further transmission, consistent with Hanoi’s annual dengue cycle, according to Xinhua News Agency.
Authorities have instructed local health units to step up monitoring across all affected areas. They have urged medical teams to quickly identify and treat new cases to contain infections early.
Additionally, mosquito-control operations, including chemical spraying, carried out in vulnerable zones to curb the spread of the disease.
The World Health Organisation (WHO) describes dengue as a mosquito-borne viral infection that thrives mainly in tropical and subtropical regions.
Many infected individuals show no symptoms, while others may experience fever, severe headaches, body pain, nausea, and rash.
Most recover within one to two weeks, but severe cases require hospital treatment.
Globally, dengue infections have surged dramatically in recent decades.
According to WHO data, reported cases rose from 505,430 in 2000 to 14.6 million in 2024. However, the true number of infections is likely to be much higher, as many mild or asymptomatic cases go unreported.
The disease is now endemic in over 100 countries.
The year 2024 marked the highest number of dengue cases ever recorded within a single year, surpassing 14.6 million infections and leading to over 12,000 deaths worldwide.
The Region of the Americas accounted for the majority of these cases, contributing more than 13 million to the global total.
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