Omsk hemorrhagic fever (OHF) is an infectious, viral disease and is endemic to parts of Russia, where it was first documented in Omsk. The disorder is characterized by bleeding from multiple orifices and organs. It is primarily spread by tick bites or contact with infected muskrats.
Omsk hemorrhagic fever (OHF) is endemic to western Siberia, where the Omsk hemorrhagic fever virus (OHFV) is primarily spread through contact with infected muskrats, ticks and contaminated water. There is no male or female predominance, and no human to human transmission.
OHF is mainly characterized by the presence of a fever, as well as bleeding diathesis. From the time of infection, symptoms may take between 3 days and 1 week to appear, occasionally preceded by malaise.
Initially, patients experience high-grade fever for up to 2 weeks, often accompanied by chills. They may also experience a headache, cough, myalgia and gastrointestinal disturbance. Bleeding can occur from multiple sites, commonly the nose and mouth. Other organs such as the uterus, gastrointestinal tract, urinary tract, lungs and skin may also bleed, resulting in complaints that include hemoptysis, hematuria, petechiae and easy bruising, with an accompanying maculopapular rash on the torso and extremities in rare cases  .
There is widespread hyperemia often seen on the upper body, dry mucous membranes, halitosis, dehydration, as well as oropharyngeal and facial edema . Many individuals become hypotensive and bradycardic. Hepatomegaly may also be diagnosed. Leukopenia and thrombocytopenia are usually present. The clinical condition worsens during the course of a few days, with additional symptoms such as gingivitis, gingival bleeding, myalgia, lymphadenopathy and hyperesthesia.
OHF is divided into two phases. The second phase of infection is only experienced by some individuals, commencing 3 weeks after the onset of symptoms. It involves the central nervous system, causing encephalitis, meningism, brain edema, and disruption of the blood-brain barrier.
Despite the plethora of symptoms, the case fatality rate is low; literature states that it is between 0.4-10%, and full recovery is the norm. Patients may have lingering general body weakness. In a minority of cases, there is permanent hearing impairment, hair loss, and neurological sequelae such as memory impairment, psychiatric disorders, and behavioral changes. The most common causes of death are internal bleeding or severe sepsis, as OHF causes increased susceptibility to secondary infections .
The classic presentation, as described above, is seen in only one in five patients . There are reported cases where the only sign of the disease is abnormal bleeding  .
- Cervical Lymphadenopathy
They might experience a focal hemorrhage in mucosa of gingival, uterus, and lungs, a papulovesicular rash on the soft palate, cervical lymphadenopathy (it occurs in the neck which that enlarges the lymph glandular tissue), and occasional neurological [en.wikipedia.org]
The infection has symptom fever, has symptom chills, has symptom headache, has symptom pain in lower and upper extremities, has symptom stiff neck, has symptom papulovesicular rash on the soft palate, has symptom cervical lymphadenopathy, has symptom [malacards.org]
Entire Body System
Omsk hemorrhagic fever (OHF) is caused by Omsk hemorrhagic fever virus (OHFV), a member of the virus family Flaviviridae. OHF was described between 1945 and 1947 in Omsk, Russia from patients with hemorrhagic fever. [cdc.gov]
Omsk hemorrhagic fever is a viral hemorrhagic fever caused by a Flavivirus.It is found in Siberia. It is named for an outbreak in Omsk. There are a number of symptoms of the virus. In the first 1–8 days the first phase begins. [en.wikipedia.org]
NOS Omsk A98.1 Omsk hemorrhagic A98.1 Omsk hemorrhagic fever A98.1 ICD-10-CM Codes Adjacent To A98.1 A95.1 Urban yellow fever A95.9 Yellow fever, unspecified A96 Arenaviral hemorrhagic fever A96.0 Junin hemorrhagic fever A96.1 Machupo hemorrhagic fever [icd10data.com]
Omsk hemorrhagic fever is a viral hemorrhagic fever caused by a Flavivirus.  It is found in Siberia.  It is named for an outbreak in Omsk. [infogalactic.com]
Trudy biol Inst sib Otd Akad Nauk SSR, 24: 122-126, 1974 Omsk hemorrhagic fever. 1985 Omsk hemorrhagic fever. The arboviruses: epidemiology and ecology Volume III: 205-216, 1988 Omsk hemorrhagic fever (state of the art). [eurekamag.com]
Persons engaged in camping, farming, forestry, hunting (especially the Siberian muskrat) are at greater risk and should wear protective clothing or use insect repellent for protection. [en.wikipedia.org]
This puts persons engaged in camping, farming, forestry, and hunting (especially the Siberian muskrat ) at great risk. Those spending time outdoors should wear protective clothing and use insect repellent for protection. [infogalactic.com]
History Play ENTRENus Play ENTRENuk Play ENTRENau Meanings of "omsk hemorrhagic fever" in Turkish English Dictionary : 1 result(s) Category English Turkish Medical 1 Medical omsk hemorrhagic fever omsk hemorajik ateşi Pronunciation of omsk hemorrhagic [tureng.com]
- Fever of Unknown Origin
[…] of unknown origin [FUO] Fever with chills Fever with rigors Hyperpyrexia NOS Persistent fever Pyrexia NOS hemorrhagic (arthropod-borne) A94 ICD-10-CM Diagnosis Code A94 Unspecified arthropod-borne viral fever 2016 2017 2018 2019 Billable/Specific Code [icd10data.com]
Symptoms of Omsk hemorrhagic fever virus includes fever, headache, severe muscle pain, cough, dehydration, gastrointestinal symptoms and bleeding problems. After 1-2 weeks of symptoms, some patients recover without complication. [histopathology-india.net]
After an incubation period of 3-8 days, the symptoms of OHF begin suddenly with fever, headache, severe muscle pain, cough, dehydration, gastrointestinal symptoms and bleeding problems. [web.archive.org]
They may also experience a headache, cough, myalgia and gastrointestinal disturbance. Bleeding can occur from multiple sites, commonly the nose and mouth. [symptoma.com]
The symptoms of this disease include fever, headache, nausea, severe muscle pain, cough, and moderately severe haemorrhagic manifestations. A third of patients develop pneumonia, nephrosis, meningitis, or a combination of these complications. [ncbi.nlm.nih.gov]
Clinical symptoms and signs of VHFs may include early onset of symptoms lasting for less than 1 week including fever, nausea and vomiting, joint and muscle pain, headache, extreme weakness, lack of strength, fatigue, sore throat, cough, chest and abdominal [hancockcountyhealthdepartment.com]
In addition, variation between the viral 5'-untranslated region of OHF and other tick-borne flaviviruses suggests potential variability in viral replication. [ncbi.nlm.nih.gov]
[…] each area coincides with vector activity HOST RANGE: Humans, rodents, muskrat and possibly ticks INFECTIOUS DOSE: Not known MODE OF TRANSMISSION: By the bite of an infective tick (Dermacentor reticulatus and D. marginatus, Ixodes persulcatus); data suggests [msdsonline.com]
The first signs and symptoms of OHF may begin between 3 to 8 days after exposure and may include chills, fever, nausea, headache, and severe muscle pain. [malacards.org]
The symptoms in this phase are: chills headache pain in the lower and upper extremities and severe prostration a rash on the soft palate swollen glands in the neck appearance of blood in the eyes (conjunctival suffusion) dehydration hypotension gastrointestinal [en.wikipedia.org]
It is characterized by fever, headache, epistaxis, GI and uterine bleeding, and other hemorrhagic manifestations. Treatment is supportive; recovery usually occurs. Omsk hemorrhagic fever [medical-dictionary.thefreedictionary.com]
Symptoms of OHF begin suddenly after about 3-8 days of infection, with chills, fever, headache, severe muscle pain, vomiting, and bleeding problems. [diseaseinfosearch.org]
Diagnosis of Omsk hemorrhagic fever is clinical, coupled with the knowledge of the endemic locations of the infection. Laboratory tests include serology such as enzyme-linked immunosorbent assay (ELISA), neutralization tests (NTs), complement fixation (CF) tests and hemagglutination inhibition (HI) . NT has the highest specificity, while CF has low sensitivity and should be used in conjunction with other tests. It is often not possible to directly detect the virus through the polymerase chain reaction as the body clears the virus before the onset of symptoms. OHFV is part of the Flaviviridae family, thus other flaviviruses are able to cross-react and thus produce false positive results for OHF. In particular, OHFV is extremely similar to Tick-borne encephalitis virus (TBEV), both in presentation and biochemical findings. It may be difficult to detect OHFV antibodies in the elderly, as they have a less pronounced response to the virus.
- Růžek D, Yakimenko VV, Karan LS, Tkachev SE. Omsk haemorrhagic fever. Lancet. 2010;376(9758):2104-2113.
- Lebedev, EP, Sizemova, GA, Busygin, FF. Clinical and epidemiological characteristics of Omsk hemorrhagic fever. Zh. Mikrobiol. 1975;11:132-133.
- Busygin GG. Omks hemorrhagic fever—Current status of the problem.Vopr Virusol. 2000;45(3):4-9.
- Belov GF, Tofaniuk EV, Kurzhukov GP, Kuznetsova VG. Clinico-epidemiological characterization of Omsk hemorrhagic fever at the period of 1988–1992. Zh Mikrobiol Epidemiol Immunobiol. 1995;(4): 88-91.
- Centers for Disease Control and Prevention. Omsk Hemorrhagic Fever (OHF). Centers for Disease Control and Prevention. https://www.cdc.gov/vhf/omsk/diagnosis/index.html. Updated December 9, 2013. Accessed August 12, 2017.