Favorite Vacation Destinations Might Include Risk for Dengue Fever - page 3

Denge fever reappears in Key West Too close for comfort. Vacationing in any of these locations? (hat tip crofsblog)... Read More

  1. by   prmenrs
    A warning for those of you w/Filipino co-workers who make trips home every couple of years--it's very easy to get dengue fever in the Philippines! One of my friends came back w/it last year!

    Unfortunately, no vaccination is available.
  2. by   indigo girl
    US: Is dengue moving north?

    H5N1: US: Is dengue moving north?

    Is anyone else getting just a tad concerned about where this is going? Ocala? I live south of Ocala in Tampa, and I am paying attention. Just barbecuing out on the deck could end up being a life shortening, and painful experience...

    Quote from crofsblogs.typepad.com
    Health officials in Miami and Ocala are reporting the first suspected cases of dengue fever, a potentially serious mosquito-borne illness that had once disappeared from the United States.

    Health officials say the Miami Beach man who is suspected of contracting the disease has fully recovered. No further information was released Thursday about the case in Ocala.
    Dengue fever gains beachhead inUS - Journal - Scott McPherson's Web Presence

    Quote from www.scottmcpherson.net
    We once had a powerful weapon to fight mosquitoes, and it was a doozy: DDT. But the advent of Silent Spring, the '60s Rachel Carson book, pretty much killed DDT like Ralph Nader killed Corvairs. Now, however, we are learning more and more about DDT. And it appears Ms. Carson took extreme liberties when it came to the effects of DDT on the environment. I am stopping short of saying Ms. Carson lied, but the effect on DDT was the same as if she had.

    How many African children could have been saved with the re-establishment of DDT? Perhaps the million per year that die from mosquito-borne viruses? Sadly, our only answer to malaria, dengue and chickungunya (all mosquito-borne) is to buy a lot of DEET-enriched repellent and to ship mosquito nets to Africa. I shake my head at that.

    Even the WHO has issued entreaties to restore the development and production of DDT. It's the only thing that reliably works on mosquitoes. And I do not believe (someone will correct me, I am sure) that mosquitoes develop a resistance to DDT.
    Last edit by indigo girl on Jul 16, '10
  3. by   indigo girl
    update on the florida dengue cases

    update on the florida dengue cases

    Quote from afludiary.blogspot.com
    late yesterday, we learned that the miami case tested negative by pcr and serum antibody tests, and late yesterday it was announced that the ocala and orlando cases were travel associated – not locally acquired.

    "it's important to remember that these cases are not endemic to this area,"

    the health department spokesperson might well have added the word `yet’ to his statement, since the way dengue is carried into new areas is through infected travelers that are bitten by local mosquitoes.

    it may, however, take a number of such visitors bringing the virus into an area before it can gain an effective toehold and begin to circulate locally.

    or, as we saw in 2007, it only took a single infected traveler to introduce chikungunya to ravenna, italy which ultimately spread to at least 290 other people.
    there is a lesson to be learned from the story of how chikungunya first arrived in italy. when the conditions favor the mosquito, and we are not paying attention, this is what can happen:

    travels in chikungunya territory : effect measure

    Quote from scienceblogs.com
    the first known (index) case of chikungunya had its onset in resident of emiglia romagna on june 15, 2007. he had recently traveled to an endemic region for chikungunya (kerala state in india) and had two episodes of fever, during the second of which he visited his cousin in castiglione di cervia. the visit was only for several hours but apparently was sufficient for a mosquito to bite first him and then his cousin, who fell ill on july 4. thereafter there were additional waves of disease throughout the two villages and some outsiders who were visiting family and friends. but by the end of august new cases were appearing in the region of emiglia romagna among people with no travel to the villages or contact with villagers. a recent status update to who under the new international health regulations have reported 131 cases, although more are expected. older people are over represented in the cases (median age 59). it isn't known whether this age distribution is a result of an older population in the two rural villages, more exposure of older people, more serious disease an therefore more complete reporting or some other factor. the most common symptom was severe joint pain. one elderly patient died and another remains in a coma.

    could chikungunya become endemic in the souttheastern us where there are a. albopictus vectors? cdc doesn't think it very likely, but before the emiglia romagna outbreak most people thought it couldn't become endemic in europe, either.

    a nasty biter among the cuckoo clocks : effect measure

    Quote from scienceblogs.com
    many of these viral diseases are found in tropical climes, although they used to be common in temperate regions. the us had quite a lot of malaria and yellow fever in the 18th and 19th centuries. these are both mosquito-borne diseases. they were eliminated by eliminating the mosquito species that carried them. lately the us has had a resurgence of encephalitis viruses, especially west nile and eastern equine encephalitis. recently a new mosquito-borne viral disease has started to take root in europe, chikugunya virus. two factors were needed. one was the virus itself, the chikungunya virus. but the other is a competent mosquito vector, in this case the vicious tiger mosquito, aedes albopictus. we discussed its origin in a couple of posts (here and here) last fall. now we find that aedes albopictus is spreading out of italy and has been found in switzerland -- north of the alps:

    a. albopictus is not only a competent vector for chikungunya infection but for dengue fever. this nasty little biter also can be found in the us southeast. i wouldn't be a bit surprised to see homegrown chikungunya and dengue in both northern europe and the southern us in the next decade.

    maybe you didn't hear it here first. but you heard it here.
    Last edit by indigo girl on Jul 21, '10
  4. by   indigo girl
    Dengue in Central Florida

    H5N1: US: Dengue spreads to central Florida

    Quote from crofsblogs.typepad.com
    Sylvia Borden was bitten by mosquitoes while on vacation last week in Key West. "That Sunday morning is when I woke up and had the pain," said Borden, who added that she had very achy joints, pain behind her eyes and a miserable headache.
    "The rash wasn't just on my arms, it was all over -- my arms, my feet, and it kept continuing."

    According to the Florida Department of Health, there are five cases already in Central Florida: one in Seminole County, two in Orange, one in Marion and one in Osceola.
  5. by   indigo girl
    Mexico Worried by Rise of Hemorrhagic Dengue

    H5N1: Mexico worried by rise in hemorrhagic dengue

    This is not good news.

    Quote from crofsblogs.typepad.com
    Mexico is facing a sort of perfect storm of floods that breed mosquitoes, prompting a big increase in the number of hemorrhagic dengue cases, the country's top epidemiological official said Wednesday.

    The disease's Type 2 strain, which makes people who have already had the Type 1 variant more vulnerable to developing the hemorrhagic form, is now in the Gulf coast state of Veracruz and moving north toward the region on the U.S. border.
    H5N1: Mexico: Uncontrolled spread of dengue in the country

    Crof's translation:

    Quote from crofsblogs.typepad.com
    The federal government has turned on the red alarm lights about the growth of dengue in the country--generated by the intense rains of recent weeks--but also about the unusual presence of various serotypes of the virus that normally don't appear at the same time, and that are transmitted by the Aedes aegypti mosquito.

    Miguel ngel Lezana, director of the National Center of Epidemiological Surveillance and Disease Control, explained that there are worries because people who have had classic dengue have now fallen ill again but with hemorrhagic dengue, which is considered more deadly.

    According to a report from the Center, 16 persons have died of hemorrhagic dengue so far this year, while only 6 were recorded in the same period of 2009.
    Last edit by indigo girl on Jul 21, '10
  6. by   indigo girl
    Dengue Reports from the Caribbean

    Dengue Reports From The Caribbean

    Mike Coston over at Avian Flu Diary blog offers good commentary on the situation in the Caribbean. He's done a great job on explaining the different types of dengue, and why it is thought that some develop the more dangerous form. It sure sounds a lot like the cytokine storm that occurs with bird flu, and other severe cases of influenza, doesn't it?

    Quote from afludiary.blogspot.com
    In the 1950s, a new form of Dengue was identified in Southeast Asia - DHF (Dengue Hemorrhagic Fever) - that while still relatively rare, if left untreated, can have a fatality rate as high as 50%.

    Since there are 4 different serotypes of the Dengue Fever virus, a person can become infected several times over their lifetime.

    Although the process is not fully understood, the evidence suggests that those having a prior Dengue infection are at greatest risk of developing DHF.

    One of the theories (greatly simplified, so even I can understand it . . . scientists may want to avert their eyes) is the body's immune system falsely `recognizes' the new infection as being the old virus and attacks it, but its antibodies are unable to successfully inactivate it.

    In response, the immune system releases a flood of cytokines that have the unfortunate side-effect of increasing the permeability of endothelial tissues (the lining inside blood vessels) which can lead to blood and fluids leaking into surrounding tissues.

    This `leakage' can lead to Hypovolemic shock, anemia, and sometimes death.

    Treatment is mostly supportive while the body builds the proper antibodies to fight the infection; blood transfusions, IV fluids, Oxygen, and rehydration.
  7. by   indigo girl
    Martinique and Guadeloupe

    H5N1: French army fights dengue in Caribbean departments

    Quote from crofsblogs.typepad.com
    Starting Monday, a special army force will help local teams already working on destroying mosquitoes and their breeding grounds around schools before they open in September.

    The army will start its operation in the south of Martinique, where the epidemic began.
    The health ministry also called on the national audiovisual council to allow public service announcements to be broadcast on television in the coming weeks, and provided more funding to regional health agencies to intensify anti-mosquito campaigns.

    Guadeloupe has been the most affected, with some 33,000 cases reported since December 2009. Martinique has reported 25,600 cases.

    According to official statistics, there were 3,400 new cases in Martinique in the first week of August and 4,000 in Guadeloupe. The second week there were 4,160 cases in Martinique and 3,700 in Guadeloupe.
  8. by   indigo girl
    France

    H5N1: France reports first mainland dengue infection: ministry

    Quote from crofsblogs.typepad.com
    France reported a first case of dengue fever infection on its mainland Monday, in the southern city of Nice, and is trying to kill mosquitoes which might be carrying the deadly disease in the area.

    The health ministry said it could not exclude an epidemic, and authorities have asked residents to take measures such as using mosquito nets and removing places where mosquito larvae can grow.

    "To prevent any spread of the virus, epidemiological and entomological surveillance measures will be reinforced. Mosquito control measures have been undertaken around the area where the affected person lives," it said.

    "The risk of an epidemic is deemed limited but cannot be excluded, because of the significant numbers of tiger mosquitoes in the area," it added.
  9. by   indigo girl
    US Virgin Islands: Dengue Outbreak Confirmed

    H5N1: US Virgin Islands: Dengue outbreak confirmed

    Quote from crofsblogs.typepad.com
    After 19 cases of suspected dengue fever-and at least one death-reported in the St. Thomas-St. John District, the V.I. Health Department issued a statement Friday saying that the district is experiencing a dengue fever outbreak.

    In the statement, Health officials urged residents to seek immediate medical care if they become ill and urged doctors to report all suspected dengue fever cases to the department, as required by law.

    "If you don't seek immediate medical care, dengue fever can lead to death," Health Commissioner Julia Sheen said in the release.
  10. by   indigo girl
    French Riviera

    French Riviera sees new case of chikungunya virus

    AFP: French Riviera sees new case of chikungunya virus

    The article starts out informing us about chikungunya then mentions dengue found in the same region of France. Both viruses are spread by the same species of mosquitoes.

    Quote from www.google.com
    The first ever "native" cases of dengue fever were detected in the French Riviera region earlier this month when two people were diagnosed with the disease that causes a flu-like illness for most victims but which can sometimes be deadly.

    Dengue is carried by the same tiger mosquito that transmits the chikungunya virus. The insect has moved north in recent years.
    (hat tip crofsblog)
  11. by   indigo girl
    Dengue fever case turns up in Miami - Health - MiamiHerald.com

    Dengue fever locally acquired in Miami , not way down in Key West. They are right, it is a big deal.

    Quote from www.miamiherald.com
    The first locally acquired case of dengue fever in Miami-Dade County in more than 50 years was confirmed Thursday by health officials. They warned people to take precautions against the mosquitoes that carry it.

    ``This is a big deal,'' said Lillian Rivera, administrator of the Miami-Dade Health Department.
    ``We have not had a locally acquired case of dengue fever since the 1950s,'' said Dr. Fermin Leguen, the department's chief epidemiologist.

    The victim, described only as a man who had not traveled outside Miami-Dade County for more than two weeks, was briefly hospitalized but has fully recovered, Rivera said. His case was confirmed by laboratory tests.
    (hat tip crofsblog)
  12. by   indigo girl
    Locally Acquired Dengue In Miami

    So, what happened? As this blogger suspects, someone probably was infected in an endemic area, then brought the disease into Miami. That person was bitten by a local mosquito. The mosquito then passed it on to a resident of Miami. That's how it spreads.

    Quote from afludiary.blogspot.com
    Last July there was another suspected case of Dengue in Miami, but that turned out to be a false alarm. Today's announcement is Florida's 2nd case of locally acquired dengue outside of the Florida Keys this year.

    According to this Miami Herald report, this case involved a different strain that the one being reported in the Keys (there are 4 serotypes of Dengue). This suggests a fresh importation, probably from someone visiting or returning from an area where Dengue is endemic.
  13. by   indigo girl
    Dengue Fever Strikess Web Presence

    Scott McPherson is the Chief Information Officer for the Florida House of Representatives. I got to meet him at a flu conference last October. He's a heck of a nice guy, and well connected enough to get inside info from researchers, scientists, and public health officers. If he is talking about a real need to bring back DDT, I'm listening, Rachel Carson not withstanding. I have been hearing this also from some health care professionals who have worked in countries where mosquito borne diseases are endemic.

    Are the mosquitoes really winning this war? Other than teling the public how to take precautions to avoid getting bitten, is anyone actually trying to eliminate these mosquitoes? If no effort is made to eliminate them, we now will have an endemic area in the US where lots of tourists from the rest of the country visit. Where else should we be looking for this, and how long will it take before we begin to hear of cases futher north as tourists return to their homes taking it with them.

    Quote from www.scottmcpherson.net
    Now "locally acquired" means the person did not travel recently to any of the known areas (or even unknown areas) where Dengue is normally found. This person did not travel, and still contracted Dengue. That means, therefore, that there are mosquitoes in Miami-Dade County carrying Dengue. Period. No other way to say it. And if one has Dengue, it is a fair question to ask how many misdiagnosed persons are out there currently, also with Dengue?

    The mosquitoes are winning. Insect-borne diseases such as Dengue, EEE, West Nile, and even bites from bedbugs are on the march. All could all be easily mitigated.

    All it takes is the political will (yes, the political will) to re-engage a little something called DDT. As you may know, I am a big proponent of the return of DDT. It's either that, or we start asking the UN for our own mosquito nets.


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