ReviewChikungunya and dengue autochthonous cases in Europe, 2007–2012
Introduction
The threat of the possible establishment of dengue virus (DENV) and chikungunya virus (CHIKV) in the Northern Hemisphere has aroused the attention of the scientific community. These two viruses need a competent vector to be transmitted. Mosquitoes of Aedes species (Stegomyia aegypti and Stegomyia albopictus)1 are such competent vectors expanding in all continents of the Northern Hemisphere, representing a main risk factor for the establishment of these emerging viral diseases. Chikungunya virus (CHIKV) is an arbovirus belonging to the genus Alphavirus, of the family Togaviridae. It has an incubation period of 2–6 days. During the last decade, epidemics occurred, starting in 2004 in Kenya and then spreading mainly across the islands of the Indian Ocean and India. In early 2005, the epidemic reached the Comoros islands, where between January and May almost two thirds of the population were infected with the virus (estimated over 215,000 infections). In May 2005, the first cases of chikungunya fever were detected on the island of La Réunion, and these numbers climbed to almost 266,000 cases up to 2007. The virus has also been introduced to the Seychelles, Mauritius, Maldives and other Indian Ocean islands. In India, an epidemic starting in 2005 resulted in millions of infections over the course of over 3 years [1], [2], [3], [4]. Chikungunya fever is an acute illness, which presents with a sudden onset with high fever (≥39 °C), myalgia, headache, fatigue and characteristic symptoms like severe joint pain and maculopapular rash. Joint pain, which appears during the acute phase, can evolve afterward in chronic arthritis. Nausea and vomiting are also frequently seen. The acute phase, which lasts 7–10 days, may develop into a chronic phase with disabling rheumatic manifestations, such as polyarthritis-like symptoms that can last several months. Neurological manifestations (especially in children), fetal infections and deaths were recorded during the large Indian outbreak [1].
Dengue virus (DENV) is an arbovirus belonging to the Flavivirus genus of the Flaviviridae family. DENV has an incubation period ranging from 3 to 14 days (on average 4–7 days) [5], [6]. There are four antigenically different serotypes of the virus (DENV-1/DENV-2/DENV-3/DENV-4). Infection with one serotype provides lifelong immunity to the same serotype but only temporary immunity to the others. Human infection with the dengue virus presented with a wide clinical presentation, ranging from asymptomatic to subfebrile to severe illness. The last dengue Classification suggested by the World Health Organization (WHO 2009) differentiates these two forms: Dengue (with or without warning signs) and Severe Dengue (defined by severe plasma leakage or severe bleeding or severe organ impairment). The previous classification (WHO 1997), which is still the most widely used, distinguished between Dengue Fever (DF), Dengue hemorrhagic fever (DHF Grad I–II) and Dengue shock syndrome (DSS or DHF Grad III–IV) [7].
In the last two decades dengue fever has become one of the most common mosquito-borne disease, appearing today in more than 120 tropical and subtropical countries with approximately 2.5 billion persons at risk of infection. In 2009, the WHO estimated the number of infections at about 50 million per year. In fact, the incidence of dengue fever has increased 30-fold over the last 50 years [8], [9]. This trend is due to the increased amount of international air travel, increased global trade, and the effects of global climate change, all being factors that contribute to the geographical expansion of the disease's vectors, Aedes spp, which can even survive cargo ship travel [10].
Section snippets
Objectives
The objectives of this analysis were to document locally occurring (autochthonous) cases of chikungunya and dengue fever in Europe and to describe risk factors for further outbreaks.
Methods
For this analysis, data were collected from English, French, Italian and Portuguese published papers. The cut-off date for the publication search was January 6th 2013. For the bibliographic research, PubMed was used and also on-line archives of Eurosurveillance, European Center of Disease Prevention and Control (ECDC), General Directorate for Health (DGS) in Portuguese and Health Administration Institute and Health Affairs of Madeira (IASAUDE) in Portuguese. The keywords used to search in
Results
The searches using the keywords gave the following results: [“Dengue AND Europe” OR “Chikungunya AND Europe” (Title/Abstract)] = 151 results, [“Dengue AND Portugal” (Title/Abstract)] = 7 results, [“Chikungunya AND Italy” (Title/Abstract)] = 80 results. From these publications, we selected 18 articles from Pubmed, 19 bulletins and circular information from Direcção-Geral da Saúde (General Directorate for Health, DGS) and Instituto de Administração da Saúde e Assuntos Sociais da IP-Região
Discussion
Although the presence of Ae. albopictus in Italy and France was reported in the '90s, local transmission of CHIKV and DENV occurred at the earliest in 2007 and 2010 respectively. This can be explained by the presence of imported virus and a wide distribution of a competent vector Ae. albopictus.
In order to assess the risk of reappearing of epidemics in the coming years many aspects should be considered: vector distribution, vector competence, virus introduction and host characteristics.
Conclusions
Given the landscape of the autochthonous cases described in this paper, the spread of dengue and chikungunya should be considered a current and relevant topic of public health.
We draw the following conclusions:
- 1.
A large number of autochthonous cases of dengue (2237) and chikungunya (231) occurred in Europe during the period of our literature analysis (2007–2012). No case of dengue but one case of chikungunya was fatal. In all dengue outbreaks, the circulating strain, identified by means of
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