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About conduct of monitoring investigation with outbreak of dengue fever domestic infection

Final update date March 8, 2019

In August 2014, a resident of Minami Ward, who seems to have been infected with dengue fever in Yoyogi Park in August 2014, Three days after onset, it was found that a mosquito was stabbed at a "dog playground" in a sea park in Kanazawa Ward's sea park. Since it is unknown whether the mosquito that stabbed this person has the power to infect dengue fever, a part of the sea park was closed and a mosquito monitoring survey was conducted.

About mosquito monitoring

Mosquitoes were captured by the light trap method (invitation by carbon dioxide), and the type was identified and the status of dengue virus possession was confirmed.
The survey was conducted approximately one week after the date of blood sucking (August 31), when the virus multiplies and becomes infectious in the body of blood sucking mosquitoes.

Implementation period: September 5, 2014 to September 9, 2014

About partial closure of facilities

Closing period: From September 5, 2014
Place to be closed: Two playgrounds for dogs in Umino Park (Sea Park No. 10 in Kanazawa-ku, Yokohama)

※There is one dog playground on the north and south sides across the Kanazawa Seaside Line "Umino Koen Minamiguchi Station".
※Even if a mosquito bites around the closed area between August 31, 2014 and September 5, 2014, there is no possibility of infection.

To the citizens

  • In 2014, several cases of dengue fever (domestic infection) who did not travel abroad in Japan occurred, but all were presumed to be infected by mosquitoes around Yoyogi Park in Tokyo, and were bitten by mosquitoes in Yokohama. No infection has been confirmed.
  • If you are traveling to an endemic area overseas (mainly tropical and subtropical areas), it is important not only to be careful not to get stuck by mosquitoes, but also to be careful not to get stuck by mosquitoes in Japan.
  • Symptoms of dengue fever include sudden fever, severe headache, joint pain, muscle pain, rash, etc. approximately three to seven days after the mosquito bites.
  • If you have a high fever due to a mosquito bite, be careful not to get stuck and consult your medical institution.

Dengue fever

Dengue fever is not a disease that can be transmitted directly from person to person. A patient infected with the dengue virus is bitten by a mosquito, the virus multiplies in the mosquito's body, and the mosquito is transmitted by sucking blood from others. In addition, it is generally said that infection will recover one week later.
For more information, see "About mosquito-borne infectious diseases."

Mosquito monitoring results

Dengue virus was not detected in Aedes albopictus collected during the investigation period.

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Inquiries to this page

Health and Social Welfare Bureau Health and Safety Department Health and Safety Division

Telephone: 045-671-2463

Telephone: 045-671-2463

Fax: 045-664-7296

Email address: [email protected]

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