Powassan virus


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Related to Powassan virus: Ixodes cookei

Po·was·san virus

 (pə-wä′sən)
n.
A flavivirus transmitted by ticks that can cause mild febrile illness as well as severe, sometimes fatal encephalitis and meningitis. It is endemic to northern North America and northeast Asia.

[After Powassan, Ontario, site of the first recognized fatality caused by this virus in 1958.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Although rare, the Powassan virus becomes increasingly prevalent.
Never mind other infections such as Powassan virus that very few labs test for.
There were 73,000 cases reported in Pennsylvania over that period, and tick-borne diseases--including Lyme disease, anaplasmosis/ ehrlichiosis, spotted fever rickettsiosis, babesiosis, tularemia, and Powassan virus, among others--affected almost 492,000 people nationwide, with Lyme disease representing the majority of cases, the CDC said in a Vital Signs report.
Serologic test results were negative for Powassan virus, Ehrlichia spp., Anaplasma spp., Lyme disease, and Rocky Mountain spotted fever.
It has been found that in North America, the ixodid tick Ixodes scapularis is the primary vector of the agents of the Lyme disease, human granulocytic anaplasmosis, human babesiosis, relapsing fever and Powassan virus. Due to the aforementioned reasons, ixodid ticks (family Ixodidae) have been the subject of numerous investigations in an effort to prevent disease transmission and provide relief from tick bites.
More Jamestown Canyon and Powassan virus disease cases were reported in 2017 than in any previous year.
For example, Powassan virus, recognized in 1958, causes a febrile illness that can be followed by progressive and severe neurologic conditions, resulting in death in 10% to 15% of cases and long-term symptoms in as many as 70% of survivors.
Although there are effective therapies available for common tickborne bacteria and parasites, there are none for tickborne viruses such as Powassan virus. In addition, there are no licensed vaccines for humans targeting tickborne pathogens.
Arthropod-Borne Flaviviruses With Potential Serologic Cross-Reactivitya Flavivirus Zika virus Dengue virus types 1-4 Yellow fever virus West Nile virus St Louis encephalitis virus Japanese encephalitis virus Powassan virus (a) Chikungunya, Eastern equine encephalitis, Western equine encephalitis, and Venezuelan equine encephalitis viruses are members of the Togavirus family and usually do not cross-react serologically with Zika.
Powassan virus 1-4 weeks Generalized weakness, fever, disease or headache, vomiting progresses to encephalitis meningoencephalitis & may include (Powassan meningismus, seizures, cranial virus- nerve palsies, aphasia, & paresis.