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5.09.2019

Aedes albopictus and the reemergence of Dengue2

Aedes albopictus and the reemergence of Dengue2

Aedes albopictus and the reemergence of Dengue2
Aedes albopictus and the reemergence of Dengue2

Dengue is a vector-borne disease, which is estimated to affect millions of people in tropical and sub-tropical areas each year, and it is spreading in those areas which have been proliferating for a relatively long time. In this issue of the magazine, Peng et al. Report of the outbreak of dengue in a South China city, which has been disease-free for more than two decades. The infection, which was due to serotype 1, was introduced by a passenger from Southeast Asia and was transmitted by the Asian Tiger Mosquito Aedes Albopeptus. Compared with Aedes Aizpi, which is the most important vector of dengue, A-Albopeptus is a less capable vector of arbovirus, and the diseases caused by it are Myelizer. However, due to the changing global distribution of A Albopiticsi, it is becoming an important important vector. In particular, the second hand tire has a worldwide business, which often contains water and is an ideal place for eggs and larvae, has been an important factor in the massive conquest of AE Alboptiks, which can easily be used for new environments. Is favorable, even in a temperate climate This extension is creating new opportunities for the spread of viruses in new areas, from Hawaii to Mauritius, AE is a common cause of epidemic in the Aegis-free countries. Outbreaks in China, like similar events, were light and short-lived. Because of the causes of epidemic due to A Albopticus, there are substitutions for a mosquito that can be a public health benefit. However, there is no solid evidence of this, and in some affected areas, a minor course of outbreaks can be explained by a relatively short period of hot weather. Since it is almost impossible to prevent AE Albopixtus from being introduced in one country, locally locating mosquitoes are the most effective means of controlling the outbreak of arbovirus.

Aedes albopictus and the reemergence of Dengue2

Dengue is an emerging contagious disease that estimates that tropical and subtropical areas affect 50-100 million people every year [1]. Demographic and social change, such as population growth, urbanization and modern transportation, have contributed a lot in the recent decades of the development of dengue virus infections and geographical proliferation.

In this issue of "BMC Public Health", HJ Peng et al. [2] Report on the repetition of dengue in a city in southern China that has been disease-free for more than two decades. The infection, which was introduced by a traveler from Southeast Asia, was transmitted by Asian Tiger Mosquito Aedes Albopeptus.

AE albopectus is generally considered less efficient vector of arbovirus than the most important vector of dengue, compared to AE. In particular, it is considered an inefficient vector of dengue, because it is not suitable for urban home environment and is less anemic compared to AE azepti. In fact, it usually feeds on a single person, and that it also feeds on animals, the likelihood of feeding on humans decreases [3]. On the contrary, AI sickness women are highly anthropophilic and often feed many people before getting enough blood to complete a gonotropic cycle. This tendency towards multiple feeding in those areas where Dengue can contribute to the explosive nature of the outbreak is AE [4, 5], whereas there is an outbreak at places where only A albopectus is present, which is light. It has given rise to the hypothesis that the spread of AE Albopticus and the resultant substitution at many places of the AE.Egypti population may actually be the result of public health benefits. However, there is no solid evidence of this. In addition, AE Alboptcus spreads to temperate climate better than AE Aizpi, outbreaks caused by Asian tiger mosquitoes can occur in those areas where AE is not present in Egypt and where infection control occurs during cold weather Favorable. In this section it can be understood that the outbreak due to AE Albopticus is usually smaller due to AE azepti. Finally, it should be noted that the specific AE Albopticus population can sometimes develop high vector potential, as suggested by a massive outbreak of dengue, which was dispersed by the mosquito on La Reunion in 1977 [ 6]. Increasing fitness in a mutation was identified for a albopictus and another mosquito-borne virus, Chikungunya virus, during an epidemic on La Reunion in 2005; A virus tension with the same mutation is also caused by an outbreak in north-eastern Italy [7, 8]

Aedes albopictus and the reemergence of Dengue2

Despite the fact that a less efficient vector is considered, the AE Albopixtus Dengue outbreak is becoming more important in generating as a result of rapid change in its overall distribution. Asian tiger mosquitoes come from East and Southeast Asia, where it basically resides on the shores of forests, reproduce tree holes and other natural reservoirs. Centuries ago it had spread to the islands of Madagascar and Indian Ocean, yet in the last 50 years it has spread to all major continents as a result of global air travel and increase in sea trade. In addition, the Second Hand Tires has a worldwide business, which often contains water and is an ideal place for eggs and larvae, has been an important factor in the massive conquest of AE Albopictus [9]]. Eggs are also resistant to drought and can survive until tires reach their destination. In the newly infected areas, mosquitoes have easily adapted for human habitations, where pottery, vase and bucket can work as breeding sites, provided that there is little vegetation. In addition, eggs can survive in colder winters, because they move to inactivated or "diopose", whereby Ab albopeptus mosquito can remain in a temperate climatic zone.

In the past decade, AE Alboptits has been vector in the various outbreaks of the world from Hawaii [10] to Mauritius [11]. In China, the outbreak of dengue transmitted by Abe Albopeptus was told in Ningbo area a few years ago [12]. There was also a single vector in the outbreak of DENV and CHIKV in AB Alboptits Gabon and Madagascar [13, 14]]. In these recent dengue outbreaks, the symptoms of the outbreak described in this issue of the journal were common: they were at places which were dengue free for many years; The virus was introduced by the Vermicomists; And the pandemic course was light and short-lived.

Aedes albopictus and the reemergence of Dengue2

In Hawaii, where dengue was absent from the mid-1940s, an outbreak caused by AE Albopixtus occurred in 2001, and it was directly connected to a large DENV-1 epidemic on French Cynthiaasia Society Society, 4,400 km southwest of the Hawaiian Islands. . However, the outbreak of Hawaii was somewhat less severe in comparison to other outbreaks caused by similar strains in the Pacific region, where AE was a major mosquito vector [10].

In Mauritius, DENV-2 was re-broadcast in 2009, after more than 10 years of the last outbreak in the 1970s. Reunion was due to the introduction of DENV-1 by non-recognized infectious passengers. AE Albopeptus, which is widely distributed in Mauritius, was a potential vector, although in June rapid increase in cases is more consistent with AE-Aegie-outbreak. However, as a result of control measures and cooler and drip season [11], its outbreak was short-lived.

The outbreak of dengue in Ningbo in 2004 was the first outbreak since 1929. This virus was introduced by a person who had returned from Thailand, and high density of mosquitoes contributed to the outbreak. Separate stress was different from other DENV-1 strains of Guangdong and Hainan. As in the study of Peng [2], molecular techniques supported epidemic clues about the geographic origin of the virus. Due to larvae infection and the eradication of freezing weather decreased mosquito density. In May 2005, dengue virus RNA could not be found in the pool of AE Albopeptus collected from the houses and ponds surrounding dengue cases housing. From November 2004 to November 2005, no new cases of dengue were reported, [12] which indicated the elimination of outbreaks [12].

The prevention and control of outbreaks caused by A-Albopeptus is a challenge. Preventing mosquitoes from entering AE Albopixtus-then the country is important, although medium-range travel can not be efficiently controlled in automobiles and trucks, and controlling long distance intrusion by limiting international tire trade, important economic impact Will happen. Thus, health promotion has become the first option, given that the breeding site, such as flower plants and vase, is effective in the form of spraying of pesticides, while sterile insect techniques are still subject to evaluation. Finally, globalization of humans and mosquitoes is playing an important role in the repetition of dengue, and the expansion of the activity of Asian tiger mosquito is creating new opportunities in new areas for viruses such as dengue and chickengunia.

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