Migratory birds can spread haemorrhagic fever
A type of haemorrhagic fever that is prevalent in Africa, Asia, and the Balkans has begun to spread to new areas in southern Europe. Now Swedish researchers have shown that migratory birds carrying ticks are the possible source of contagion. The discovery is being published in the US journal Emerging Infectious Diseases.
Crimean-Congo Haemorrhagic fever is a serious disease that begins with influenza-like symptoms but can develop into a very serious condition with high mortality (30%). The disease occurs in Africa, Asia, and the Balkans but it has recently started to spread to new areas in southern Europe. It is caused by a virus that is spread by tick bites and common host animals are various small mammals and ungulates. Humans are infected by tick bites or close contact with contagious mammals.
Researchers have now studied the dissemination mechanisms of this potentially fatal disease. The study is multidisciplinary, with bird experts, tick experts, molecular biologists, virologists, and infectious disease physicians from Uppsala University and Uppsala University Hospital in collaboration with colleagues from the Swedish Institute for Communicable Disease Control, Kalmar and Linköping. Ornithologists and volunteers also helped gather birds.
During two spring seasons in 2009-2010, a total of 14,824 birds were captured at the two ornithological stations Capri (Italy) and Anticythera (Greece), on their way from Africa to Europe. A total of 747 ticks were gathered and analysed for the virus.
Some 30 different bird species were examined, and one species, the woodchat shrike, which winters in southern Africa and nests in Central Europe, proved to be a carrier of virus-infected ticks.
'This is the first time ticks infected with this virus have been found on migratory birds. This provides us with an entirely new explanation of how this disease, as well as other tick-borne diseases, has spread to new areas, where new mammal populations can be infected by the infected ticks', says Erik Salaneck, one of the authors of the study.
The Hyalomma tick, which spreads the disease, does not thrive in northern Europe, preferring warmer latitudes. But with a warmer climate, the boundary for both the tick species and the disease could move northward with the help of migratory birds.
More information: wwwnc.cdc.gov/eid/… _article.htm
Journal reference: Emerging Infectious Diseases
Provided by Uppsala University
- New tick-borne disease discovered Sep 20, 2011 | not rated yet | 0
- Surprising study results: More cattle means less Lyme disease Apr 16, 2012 | not rated yet | 0
- Birds Play an Important Role in the Spread of Lyme Disease Dec 23, 2009 | not rated yet | 0
- Ticks are on the march in Britain Mar 23, 2011 | not rated yet | 0
- Precautions for tick-borne disease extend "beyond lyme" Sep 07, 2012 | not rated yet | 0
- Motion perception revisited: High Phi effect challenges established motion perception assumptions Apr 23, 2013 | 3 / 5 (2) | 2
- Anything you can do I can do better: Neuromolecular foundations of the superiority illusion (Update) Apr 02, 2013 | 4.5 / 5 (11) | 5
- The visual system as economist: Neural resource allocation in visual adaptation Mar 30, 2013 | 5 / 5 (2) | 9
- Separate lives: Neuronal and organismal lifespans decoupled Mar 27, 2013 | 4.9 / 5 (8) | 0
- Sizing things up: The evolutionary neurobiology of scale invariance Feb 28, 2013 | 4.8 / 5 (10) | 14
Classical and Quantum Mechanics via Lie algebras
Apr 15, 2011 I'd like to open a discussion thread for version 2 of the draft of my book ''Classical and Quantum Mechanics via Lie algebras'', available online at http://lanl.arxiv.org/abs/0810.1019 , and for the...
- More from Physics Forums - Independent Research
More news stories
The globe remains unprepared to deal with the risk of a massive virus outbreak, the deputy chief of the World Health Organization warned Tuesday, amid fears that H7N9 bird flu striking China could morph into a form that spreads ...
Diseases, Conditions, Syndromes 19 minutes ago | not rated yet | 0
Among patients with acute exacerbations of chronic obstructive pulmonary disease (COPD) requiring hospital admission, a 5-day glucocorticoid treatment course was non-inferior (not worse than) to a 14-day course with regard ...
Diseases, Conditions, Syndromes 41 minutes ago | not rated yet | 0
African-Americans are less likely than whites and women are more likely than men to have had a prior diagnosis of chronic obstructive pulmonary disease (COPD) regardless of their current disease severity, according to a new ...
Diseases, Conditions, Syndromes 42 minutes ago | not rated yet | 0
Variation in the gene MUC5B among patients with idiopathic pulmonary fibrosis was associated with improved survival, according to a study published online by JAMA. The study is being released early online to coincide with i ...
Diseases, Conditions, Syndromes 45 minutes ago | not rated yet | 0
The level of immunity to the recently circulating H7N9 influenza virus in an urban and rural population in Vietnam is very low, according to the first population level study to examine human immunity to the virus, which was ...
Diseases, Conditions, Syndromes 4 hours ago | not rated yet | 0 |
(HealthDay)—The overall health of Americans isn't improving much, with about six in 10 people either overweight or obese and large numbers engaging in unhealthy behaviors like smoking, heavy drinking or ...
9 minutes ago | not rated yet | 0
(HealthDay)—The monstrous tornado that devastated Moore, Okla., on Monday, killing dozens of adults and children, is a stunning example of violent weather that can affect a child's mental well-being.
20 minutes ago | not rated yet | 0
As many as 35 percent of Mexican young adults may have a genetic predisposition for obesity, said a University of Illinois scientist who conducted a study at the Universidad Autónoma de San Luis Potosί.
47 minutes ago | not rated yet | 0
A federal court in San Francisco Tuesday struck down Arizona's ban on abortions after 20 weeks of pregnancy.
10 minutes ago | not rated yet | 0
A study of veterans at high risk for developing lung cancer shows that low-dose computed tomography (LDCT) can be highly effective in helping clinicians spot tiny lung nodules which, in a small number of patients, may indicate ...
41 minutes ago | not rated yet | 0
(Medical Xpress)—Native peoples in regions where cameras are uncommon sometimes react with caution when their picture is taken. The fear that something must have been stolen from them to create the photo ...
4 hours ago | 4 / 5 (3) | 0 |