Health Officials Warned of Pool Fever outbreak in Japan


In a startling revelation, Japan is grappling with a significant upsurge in reported cases of “swimming pool fever,” also known as pharyngoconjunctival fever. This announcement was made by the National Institute of Infectious Diseases on November 21. It indicated a worrying spike in this illness, which is usually associated with swimming pools that are not properly disinfected and is spread most commonly during summer.

A nationwide surge of cases of pharyngoconjunctival disease has been reported in the week from November 6 through November 12. Around 3,000 pediatric clinics diligently monitored and reported cases. The average number of patients affected by the disease was 3.23 per clinic during this time period. This alarming figure is the highest since 1999. It coincides with the adoption of the current laws on infectious diseases in Japan.

The national average has now breached 3.0 patients for the first time ever in Japan’s history. This is a critical threshold that prompts local governments to issue warnings. As of today, 25 of Japan’s 47 Prefectures have exceeded this alert threshold. This highlights the wide spread of the outbreak.


Electron microscopic image of the adenovirus (Image by the U.S. Centers for Disease Control and Prevention)

What is Swimming Pool Fever?

Swimming pool fever is an type RWI (recreational waters illness) caused by an adenovirus. Symptoms include fever, conjunctivitis, and sore throat. Adenoviruses can be transmitted to the body by the nose, mouth, or eyes when individuals are exposed to water that contains them. Swimming pool fever is characterized by the inflammation of the mucous tissues of the throat and conjunctiva. In severe cases it can even lead to pneumonia. A significant percentage of children under 5 years old are affected.

Adenoviruses can affect various parts of the human body including the respiratory system, the eyes, the intestines and the urinary tract. Adenoviruses come in different forms, and some strains can cause pharyngoconjunctival syndrome.

Swimming pool fever is caused by adenoviruses that are transmitted through contaminated water. This occurs most commonly in pools which have not been properly disinfected. Adenoviruses can survive in water for long periods of time. This makes them a particular problem in environments with poor water quality or hygiene.

In addition to breaking all previous records, the unprecedented outbreak of swimming pools fever in Japan also caused widespread concern amongst health authorities. The NIID has taken precautionary measures to combat this worrying trend. It urges teachers and children to refrain from visiting these facilities if there are any signs of illness. The institute also stresses the importance of infection prevention practices such as regular handwashing, avoiding sharing towels and disinfecting toys and surfaces that are frequently touched.

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