It is the top of this page

About infectious disease that mosquito transmits

Dengue fever, dicow yl infectious disease

Last update date April 16, 2019

Mosquito-mediated infectious disease is infectious disease that mosquito with pathogens such as virus or protozoan is infected with as kyuchi does Homo sapiens.
There are the West Nile fever, yellow fever, dicow yl infectious disease (jika heat), chikungunia heat, dengue fever, Japanese Encephalitis, malaria.

A lot of infectious diseases that mosquito transmits are reported abroad.
When we make a voyage abroad, we grasp the local fashion situation before travel, and let's perform infection prophylaxis.
Furthermore, most of these infectious diseases are found to be able to transmit mosquito (human line stripe mosquitoes) inhabiting Japan widely.
Attention is necessary after returning home to prevent that infection enlarges from person who is infected abroad, and returned home in country.

As for the measures to prevent infection, gutameniogo-proof, please confirm infection.

We are not bitten by mosquito which does not increase poster mosquitoes


  • Cause: Dicow yl (flaviviral course Flavivirus)
  • Infection course: We are infected by being bitten by mosquito (striped mosquitoes such as yellow-fever mosquito, human line stripe mosquito) with dicow yl. In addition, by blood donation and sex, we may be infected.
  • Outbreak area: It occurs in Asia, Central and South America, Caribbean countries, Africa, Oceania, Pacific Islands, the North America region.
  • Symptom: After latency period of 2-12 days (a lot 2-7 days), slight fever, headache, arthralgia, muscular pain, rash, conjunctivitis appear. In addition, it turns out infection of pregnant woman causing microcephalic outbreak of fetus and that it causes neurologic symptom (Guillain-Barre syndrome).
  • Treatment: There is not special cure and gives symptomatic treatment.
  • The prevention: There is no vaccine. It is the only preventive method that prevents you from being bitten by mosquito.

Particularly, let's be careful about next.

  1. To person made a voyage to in endemic area

Let's take enough measures not to be bitten by mosquito! As for the measures method, please see "to save preventing infection".

  1. Toward pregnant and partner

Dicow yl infection during pregnancy may cause microcephalia of fetus.

The pregnancy with possibility and pregnant woman will refrain from travel to endemic area as much as possible.

It is necessary to take close mosquito-proof measures locally out of necessity when we make a voyage.


In addition, about the prevention of sexual intercourse infection, next is recommended.

  • When man and woman is staying in plague spot together, you use condom, or, in the case of sexual intercourse, refrain from sexual intercourse with or without symptom after returning home from plague spot for at least six months (when partner is pregnant woman during gestational period).
  • As for at least six months, have the pregnancy in endemic area with or without symptom about woman of kyojikibo with a history of travel.

To all of the medical institutions

The details of dicow yl infectious disease

  • Cause: Dengue virus (flaviviral course Flavivirus)
  • Infection course: We are infected by being bitten by mosquito (striped mosquitoes such as yellow-fever mosquito, human line stripe mosquito) with dengue virus.
  • Outbreak area: It occurs in Asia, Central and South America, the tropical zone, subtropics including Africa. It is reported that there are 50 million - 100 million patients all over the world every year.
  • Symptom: After the incubation period of 2-15 days (a lot 3-7 days), sudden fever, headache, arthralgia, muscular pain, rash appear. A part may suffer from dengue hemorrhagic fever of severe form.
  • The prevention, treatment: There is no vaccine. In addition, there is not special cure and gives symptomatic treatment.

We were infected abroad, and in late years reports of person to develop in after returning home increased, and domestic infection was confirmed after an interval of about 70 years in 2014.
(as for the correspondence of Yokohama-shi at the time, please see nope ji about "correspondence to domestic infection example of dengue fever".)
About 10 - 20 is reported every year in Yokohama-shi, and attention is necessary. As for the measures method, please see "to save preventing infection".

To all of the medical institutions

The details of dengue fever

  • Cause: chikunguniauirusu (the Japanese hemlock virus department alpha virus genus)
  • Infection course: We are infected by being bitten by mosquito (striped mosquitoes such as yellow-fever mosquito, human line stripe mosquito) with chikunguniauirusu.
  • Outbreak area: It occurs in Africa, South Asia, Southeast Asia. The fashion was reported in Italy in 2007.
  • Symptom: After the incubation period of 3-12 days (normal 3-7 days), sudden fever, arthralgia, headache, muscular pain, rash appear.
  • The prevention, treatment: There is no vaccine. In addition, there is not special cure and gives symptomatic treatment.

The details of chikungunia heat

  • Cause: West Nile virus (flaviviral course Flavivirus)
  • Infection course: In the natural world, infection is repeated between chicken (mainly crow) and mosquitoes. We are infected by being bitten by mosquito (striped mosquitoes such as culices such as Culex pipiens, human line stripe mosquito) holding West Nile virus.
  • Outbreak area: Of Africa, Europe, the Middle East, Central Asia, west Asia occurred as far as is wide, but the fashion occurs in the western hemisphere including Europe and the United States which there was not of report until late years.
  • Symptom: After the incubation period of 2-14 days, sudden fever, headache, dorsal pain, muscular pain, rash appear. Meningitis and encephalitis may develop when aggravated.
  • The prevention, treatment: There is no vaccine. In addition, there is not special cure and gives symptomatic treatment.

The details of the West Nile fever

  • Cause: Falciparum

Independent or mixed infection such as Plasmodium vivax (tertian Falciparum) of Plasmodium genus protozoan, Plasmodium falciparum (falciparum malaria parasite), Plasmodium malariae (4th heat Falciparum), Plasmodium ovale (egg-shaped Falciparum)

  • Infection course: We are infected by being bitten by mosquito (malaria mosquito) holding Falciparum.
  • Outbreak area: It occurs in the Africa, Asia and South Pacific countries, the tropical zone, subtropics including Central and South America. According to the estimation of the World Health Organization (WHO), it is said that 2 million deads are with person of more than 200 million incidence a year. Report of person who was infected abroad in Yokohama-shi is several every year.
  • Symptom: After the incubation period of 10-30 days, fever, face flush, headache, muscular pain, respiratory symptom, gastroenteritis symptom appear. Fever repeats the fever period and the normal temperature period. It is aggravated and may result in death when we do not cure immediately (latency period, symptom, interval between the fever vary according to types of Falciparum.).
  • The prevention, treatment: Preventive internal use of antimalarial is effective. In addition, we are treated with the dosage of antimalarial if malaria is diagnosed.

The details of malaria

  • Cause: Yellow fever virus (flaviviral course Flavivirus)
  • Infection course: We are infected by being bitten by mosquito (mainly yellow-fever mosquito) with yellow fever virus.

Infection ring has following three.
(1)Primate (infected with Homo sapiens accidentally) except primate - mosquito - Homo sapiens except tropical rain forest (the forest) model cycle ... Homo sapiens
(2)Urban cycle ... ... ... Homo sapiens - mosquito - Homo sapiens
(3)Primate except middle (savanna) model cycle ... Homo sapiens - mosquito - Homo sapiens
Urban cycle may cause large-scale outbreak of.

  • Outbreak area: It is prevalent in the tropics of Africa and Central and South America. According to the estimate of World Health Organization (WHO), it is said that 60,000 deads are with person from 80,000 a year to 170,000 of incidence.
  • Symptom: After the incubation period of 3-6 days, fever, headache, muscular pain, back ache, vomiting appear. Even if most are infected, there is not symptom or is over only for light symptom, but approximately 15% of people of onset are aggravated. In that case, secondary to the remission (but it does not completely heal temporarily symptom reduction or disappearing) from several hours to around one day period, revival of high heat and jaundice and bleeding tendency progress, and it is said that 20-50% die.
  • The prevention, treatment: Vaccinations is effective. As for the treatment, symptomatic treatment plays a key role. The presentation of Yellow Book of yellow fever may be demanded on entry depending on country. We can inoculate Vaccinations of yellow fever only with specific inoculation engine.

The details of yellow fever

Let's warn person made a voyage to to foreign countries not to be bitten by ... mosquito! ...

Point (medical treatment guidelines on infectious disease mosquito-mediated reference:) of use of protecting against insects agent (repellent)

  • Let's choose thing which effective ingredient "deet" (DEET) and "Ikari gin" (atomic bomb lysin) are included in to prevent mosquito.
    (in Japan, as for a maximum of 30% of deet, thing of a maximum of 15% of density is sold to Ikari gin.)
  • We follow use, the point and precautions depending on age, and let's use appropriately.
  • By water and sweat, we will repaint the durability of effect diligently to fall.
    When we use sunscreen, let's paint with protecting against insects agent from the top.
  • It will prevent you from leaving small exposure part such as neck, ear, the back of the hand, ankle.
  • Mosquito-repellent incense and mosquito net will take measures indoors not to be bitten by mosquito.
    (we work on yellow-fever mosquito indoors.)
  • When have symptoms such as fever after returning home and returning home, quarantine stationThe nearest Health and Welfare CenterPlease consult with this.
  • When we have symptoms such as fever, commercial antipyretic analgesic will prevent you from drinking.
  • After returning home, let's take measures not to be bitten by mosquito without symptom for around two weeks.
  • Blood donation within four weeks will restrain itself from returning home day from foreign countries to prevent the transfusion-associated infection spread.
  • We gathered up about infectious disease measures when we made a voyage abroad.Page to "person made a voyage to abroad"Look at this.

Let's reduce personal mosquito

As for the measures for human line stripe mosquito, flyer "is careful about mosquito" (PDF: 623KB), and please see (February, 2018 update).

Including differentiation with case ... other virus diseases with a history of foreign tour, please examine introduction of Yokohama Municipal Citizen's Hospital.

As we examine inspection in Yokohama City Inst. of Health when dengue fever and dicow yl infectious disease are strongly doubted by ... progress and medical examination result when there is not foreign tour career, please consult at the following.

[weekdays from 8:30 to 17:15] contact information of Health and Welfare Center Health and Welfare Division Health Promotion Section of each ward

[the overtime mentioned above] contact information of each ward Health and Welfare Center of the night, holiday

2017

June 1, 2017 "do not increase mosquitoes in ... this summer calling for measures of mosquito by bus and subway either! We are not bitten by mosquito! ... press release material (PDF: 405KB)

2016

Press release material (PDF: 733KB) which "strengthens preventive enlightenment of mosquito-mediated infectious disease" on May 18, 2016

2015

June 2, 2015 "start monitoring investigation of mosquito in 25 city!" Press release material (PDF: 348KB)

Adobe Acrobat Reader DC (old Adobe Reader) is necessary to open file of Portable Document Format.
Person who does not have can download free of charge from Adobe company.
Get Adobe Acrobat Reader DCTo downloading of Adobe Acrobat Reader DC

Inquiry to this page

Health and Social Welfare Bureau health security department health security section

Telephone: 045-671-2463

Telephone: 045-671-2463

Fax: 045-664-7296

E-Mail address [email protected]

Return to the previous page

Page ID: 197-460-950

We come back to the top