The Vietnam National Children’s Hospital in Hanoi has seen a sharp upward trend in Adenovirus cases among children this month.
From September 1 through 9, the hospital confirmed 383 new infections. Hospital officials traced one cluster to a public swimming class, where four of five children in the same session contracted the virus from one another.
Symptoms shift, complicating early detection
Physicians at the hospital noted the current wave differs from past outbreaks. Adenovirus usually causes respiratory infections, pink eye, or stomach issues in younger children, but older patients now show prolonged high fevers lasting three to five days. These fevers often resist standard medication.
Nguyen Thi Mai Hoan, head of the hospital’s general outpatient department, said many children arrived with persistent high fever before tests confirmed the infection. Blood tests revealed higher white blood cell counts and C-reactive protein levels, signaling widespread inflammation. “Most children have continuous fever,” she said, “though some don’t develop the usual symptoms.”
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The change has made early diagnosis more difficult. Parents may assume the fever is a common illness, delaying treatment until complications develop. Without clear respiratory or stomach symptoms, families might not seek medical help in time.
The virus spreads easily through respiratory droplets, contaminated surfaces, or shared pool water. Schools, playgrounds, and group activities—where children gather closely—have become high-risk settings.
Public spaces under scrutiny
The swimming class cluster shows how quickly Adenovirus can spread in shared recreational areas. Health experts noted outbreaks often increase during seasonal transitions, when children spend more time outdoors and in groups.
Managers of pools, schools, and playgrounds have been told to intensify cleaning, improve airflow, and reduce crowd sizes. Regular disinfection of water and surfaces is essential, along with controlling occupancy in enclosed spaces.
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Parents should keep children with fever, cough, or digestive issues away from crowded places. Antibiotics, which don’t treat viral infections, should only be used if prescribed. Instead, officials advise watching for persistent symptoms, especially high fever, and seeking care if they last more than a few days.
Adenovirus circulates year-round but typically becomes more prevalent during seasonal transitions and the summer months, when children spend more time outdoors and participate in group activities.
Containment remains the priority. Public health advice focuses on basic steps: frequent handwashing, avoiding shared items, and keeping sick children isolated until they recover. However, with older children now falling ill in larger numbers—and often without obvious symptoms—these measures may fall short.
The virus is behaving unpredictably, making it harder to control.