Veripusseissa babesian riski

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Liittynyt: Ke Tammi 21, 2009 14:16

Veripusseissa babesian riski

Viesti Kirjoittaja soijuv » Ke Syys 14, 2011 13:10

USA Today 2011. Malarian kaltaisen taudinkuvan aiheuttava, joillekin jopa hengenvaarallinen parasiitti, on yleisempää kuin lääkärit ymmärtävätkään. Kyseessä on Babesioosi. Babesiatartunnan voi saada punkkien lisäksi esim. verensiirrosta. CDC:n mukaan ainakin 159 ihmistä on saanut babesian veren välityksellä 2000-luvulla. Ilmoitettujen tapausten määrä on ollut nousussa. Verensiirtoja ei tule pelätä mutta tartuntariskistä tulee olla tietoinen.

Viime tammikuusta lähtien tautitapaukset tulee ilmoittaa ja rekisteröidä (USA). Puolessa vuodessa punkkien välityksellä saatuja tartuntatapauksia oli ilmoitettu jo 314. Babesia ei kuitenkaan ole läheskään yhtä yleinen kuin borrelioosi.

Suom.huom. Vaikka ihmiset matkustavat runsaasti, ei Suomessa juurikaan tutkita babesian mahdollisuutta sairaustapauksissa.

http://yourlife.usatoday.com/health/sto ... csp=34news


Tick-borne parasite may be creeping into blood supply
By Elizabeth Weise, USA TODAY
Updated 9/7/2011 12:44 AM

A potentially life-threatening parasite in ticks capable of causing malaria-like illness is more prevalent than doctors realized and can be transmitted through blood transfusions.

The black-legged tick carries the babesia parasite.

Centers for Disease Control and Prevention

The black-legged tick carries the babesia parasite.

Enlarge

Centers for Disease Control and Prevention

The black-legged tick carries the babesia parasite.
It has infected at least 122 people since 2000, says a study out Tuesday by researchers at the Centers for Disease Control and Prevention (CDC).

The finding doesn't mean transfusions are dangerous, only that physicians need to be aware of a previously invisible illness. "People should not be afraid to get blood transfusions," says Barbara Herwaldt, a specialist in parasitic diseases at the CDC who is lead author on this week's paper in the journal Annals of Internal Medicine. "In the big picture this is a small possibility, but it's something important that we want people to be aware of, because it can be life threatening and it is treatable."

The babesia parasite (bah-BEE-zee-ah) causes an illness called babesiosis (bah-BEE-zee-oh-sis). The parasites are carried by the common deer tick, also known as the black-legged tick.

Babesia infections can range from so mild the victims don't know they're ill to severe. The parasite invades red blood cells. Symptoms include fever, chills and muscle pain. Complications can include blood cell destruction, organ failure and death.

Doctors are especially concerned because it appears that the risk of transfusion-associated babesia infection may be increasing. Cases are occurring year-round and have been seen in states where ticks that carry babesia are not endemic.

There's no Food and Drug Administration-approved test for the parasite in blood supplies, so blood banks rely on asking would-be donors about flu-like illnesses and tick bites. Several companies are working on creating screening tests, Herwaldt says.

Since 1979, when the first transfusion-associated case was found, 159 such cases have been reported, 77% of them since 2000.

The first known case of ticks transmitting the babesia parasite was in Massachusetts in 1969. In 1979, the first transfusion-associated case was found.

It wasn't until this January that babesiosis became a disease that doctors were required to report to their local health department. Between Jan. 1 and Aug. 20, 314 cases of babesiosis from ticks were reported.

However, the public shouldn't be too concerned. Although babesia is more common than doctors had realized, "it's nowhere near as common as Lyme disease," Herwaldt says.

The bulk of the cases are in the seven states where babesia-infected ticks are most commonly found: Connecticut, Massachusetts, Minnesota, New Jersey, New York, Rhode Island and Wisconsin. Although numbers are not certain, people appear about 100 times more likely to get babesiosis from ticks than from blood transfusion, Herwaldt says.

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