Vicious mosquito heads to Australia, its bite loaded with dengue fever

Australia is getting ready for an invasion by an aggressive and exotic pest that threatens to spread dengue fever to southern capitals.

Queensland scientists have begun breeding the Asian tiger mosquito, a hugely invasive species which is in a position to bite dozens of instances a minute.

They are closely learning the country’s only colony of the insect, caged behind a series of locked doors in Brisbane’s QIMR Berghofer Health-related Research Institute.

Associate professor Greg Devine says the analysis is vital provided the mosquito’s prospective to introduce the debilitating chikungunya virus and spread conditions such as dengue to capital cities.

“What we’d like to realize is the genuine risk of transmission in urban centres like Brisbane and Sydney,” he stated.

“We are also hunting at the way it would interact with native mosquitoes so we can determine how quick its affect will be.”

But its best effect will be on Australia’s outdoor lifestyle because it thrives in and close to residences and bites all day.

“It’s come to be known as the barbecue stopper, and for very good reason,” Devine mentioned.

The large and aggressive mosquito is capable of spreading several illnesses, such as Ross River virus, yellow fever and chikungunya.

There is no therapy for the Chikungunya virus, typical in south-east Asia, which can depart sufferers with extreme joint ache for months.

When the Asian tiger mosquito will invade Australia is not recognized but Devine stated it would be a case of when, not if.

“It’s absolutely only a matter of time,” he said.

“It arrived in the Torres Strait about 2005, but of program that’s not the only route at which it can come in.

“There is no doubt it is coming eventually simply because it’s been picked up so many occasions at Australia’s borders.”

Vicious mosquito heads to Australia, its bite loaded with dengue fever

Football fans warned about dengue fever risk at Fifa Globe Cup in Brazil

Sao Paulo is fighting a significant outbreak of dengue fever. The disease spreads swiftly in crowded locations. Photograph: Mauricio Lima/AFP/Getty Images

Brazil has the highest incidence of dengue fever in the globe.

Final year, instances spiralled to a new substantial of 1.4 million and the trend demonstrates no indications of abating. São Paulo, host city for the opening ceremony of the FIFA World Cup on June twelve, battled a significant dengue outbreak this month. “Our campaign has not been effective,” laments Guilherme Ribeiro, an epidemiologist who specialises in infectious ailments at the Institute of Collective Health at the Federal University of Bahia. “We commit a great deal of funds and dengue is a priority for the government but regrettably 2013 was the worst 12 months on record.”

Ribeiro understands the mosquito-borne illness effectively having suffered the fever twice and studied it up shut in his native Salvador. A sprawling metropolis of two.6 million with large rises towering more than a sea of shanty towns, Brazil’s third largest city is a prime breeding ground for the Aedes aegypti mosquito which transmits dengue. Salvador is a single of the twelve host cities for the Planet Cup and wellness officials are paying near consideration. In mid-June, the rainy season will commence tapering off and dengue will be at its peak in the area.

Not like malaria and yellow fever which are primarily found in the Amazon states and other thinly populated components of the nation, dengue is rampant in urban places in which 85% of Brazil’s population lives. Swiftly increasing cities and towns have supplied an best environment for the spread of dengue. A tropical climate combined with bad infrastructure for water and sanitation motivate the proliferation of the Aedes mosquito, which can breed in as little as a teaspoon of water.

But what can make the urban mosquito specially hazardous is the truth that in densely populated neighbourhoods, it does not have to travel far to infect a massive number of individuals. A latest examine warned that, “overcrowded cities current extremely favourable situations for enhanced transmission,” and that São Paulo was in danger of turning out to be a sizzling spot due to the fact all four dengue virus strains have been in circulation there throughout an outbreak in 2013 – a first for a massive city in Brazil.

There is no cure for dengue and it can sometimes be fatal. Public health professionals are pinning their hopes on a vaccine which they feel will be the most powerful way to fight the ailment. A number of vaccines are in growth and Brazilian scientists are doing work on one edition at the Butantan Institute in São Paulo. It was produced in partnership with the US-primarily based Nationwide Institutes of Health. Early outcomes are promising and the vaccine will be moving into phase 3 clinical trials at the finish of up coming year.

In the meantime, the best way to get rid of mosquitoes is to eliminate their breeding locations but Salvador is a excellent example of how chaotic urban sprawl can make the process almost not possible. “The mosquito is incredibly effectively adapted to our urban setting,” says Ribeiro pointing to the blue water tanks which are a common sight on rooftops close to the city. They also come about to be an ideal incubator for mosquito larvae which thrive in dark, damp spaces. The tanks are extensively utilised because piped water provide during the city is intermittent. There is widespread public awareness about the want to keep tanks and water containers covered and clean but it does not always translate into action. “The campaign only functions when the local community participates,” says Angélica Andrade Santos, a well being official in the Pau da Lima area.

A single of the favelas (shanty towns) in Pau da Lima is a base for epidemiologists like Ribeiro who go there to perform discipline research on infectious ailments. There are presently a few dengue instances in late March, such as one particular 16-year previous with hemorrhagic fever, the most virulent sort. In accordance to a nevertheless-to-be published research carried out in 2010 by the Institute of Collective Wellness and the Oswaldo Cruz Basis, 95% of the adults in this favela have been exposed to the virus. But dengue is not confined to poor neighbourhoods. Other research have located that the virus circulated in densely populated neighbourhoods across the city affecting rich and bad alike.

Dengue Mata (Dengue Kills) billboards greet visitors as they drive into the city from the airport. It is a blunt warning from the well being department to the several site visitors and soccer supporters who will quickly be arriving in Salvador. Simon Hay, an Oxford-based epidemiologist, urged Brazilian authorities to aggressively remove mosquitoes all around the northeastern stadiums.

But Ribeiro says it is unlikely that the ultra-modern Arena Fonte Nova poses a dengue threat simply because it is a nicely maintained public space with extremely tiny standing water. He advises site visitors to instead be alert to the risk on the streets saying, “one week in Salvador is a lot more risky than currently being at the stadium.”

Study a lot more stories like this:
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• NTDs: ailment handle is about a lot far more than medicines
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Football fans warned about dengue fever risk at Fifa Globe Cup in Brazil

Globe Cup supporters at risk of dengue fever in Brazil

Scientists operating with Prof Hay have recognized nine of Brazil’s stadiums as getting in dengue-plagued regions.

“Dengue fever could be a substantial dilemma in some of the tournament areas, and preventive measures are required,” Prof Hay writes in the journal Nature.

“Fifa, the Brazilian authorities and the World Cup sponsors must use their influence and experience to communicate the risk.”

The season for dengue fever normally ends in Might, a month just before the Globe Cup is due to get started.

But the northeast of Brazil is going through a heatwave, and public wellness officials warn that the mosquito breeding season might extend by means of the Planet Cup.

The north-eastern cities of Natal, Fortaleza, Recife and Salvador will host 21 video games amongst them, which includes Germany vs Portugal, Spain vs the Netherlands and potentially, a number of England video games.

England’s very first game towards Italy will be held in the humid setting of Manaus, in the Amazon rainforest.

If England finish prime of their group, they will play the runners-up from Group C in Recife’s Arena Pernambuco on June 29.

Should they win that game, their quarter-last will be held in Salvador’s Arena Fonte Nova six days later.

If they finish second, their quarter-final will be held in the Estadio Castelao in Fortaleza.

Climate researchers from the University of Reading say there is a 60 per cent likelihood of an El Nino event for the duration of the World Cup, which could lead to heatwaves and drought in Brazil.

El Nino is characterised by larger sea temperatures in the Pacific Ocean.

It typically brings about large amounts of rain, major to floods on the west coast of North America.

But in South America, it can lead to drier and hotter weather and create the ideal breeding circumstances for mosquitoes.

Dengue fever is a viral infection that generally produces a extreme fever and large temperature, among other symptoms that may possibly call for hospitalisation.

The condition has a basic stage and a significant stage that influences around 5 per cent of sufferers.

It can lead to seizures and excruciating joint discomfort, explaining why dengue is also identified as “break bone fever”.

The virus has 5 separate subtypes, with subsequent infection by one more type far more most likely to lead to severe signs and symptoms, this kind of as the life-threatening dengue haemorrhagic fever.

It is transmitted by female Aedes aegypti mosquitoes, which bite in the course of the day and lay their eggs on stagnant water.

There is no remedy or vaccine, so public health bodies in Brazil have attempted to lessen the risk of Dengue fever using insecticides and larvicides, and by targeting the areas of water on which mosquitoes breed.

But there may possibly be a novel solution on hand in time for the Planet Cup.

British biotec company Oxitec has created a mosquito with a modified gene that can only be kept alive with the antibiotic tetracycline. The modified males are launched to mate with the wild female population. Their offspring is unable to survive without antibiotics.

Brazil has, for the past two many years, conducted a trial of the genetically modified mosquitoes in Bahia state.

Brazilian company Moscamed released the world’s greatest ever swarm of GM mosquitoes in Jacobina, a town in Bahia, final month.

“We need to have to supply alternatives since the technique we have now in Brazil doesn’t work,” stated Aldo Malavasi, the president of Moscamed.

“We have thousands and thousands of cases of dengue and that expenses a whole lot for the country. Folks are unable to function.”

The company has reported a 90 per cent drop in wild Aedes aegypti mosquitoes in the town so far.

Globe Cup supporters at risk of dengue fever in Brazil

Nauru dengue fever outbreak sparks fresh worries about detention centre

An outbreak of dengue fever at an Australian refugee detention centre in Nauru sparked calls on Thursday for greater oversight at the facility, which has been criticised by rights groups and the United Nations.

Immigration minister Scott Morrison’s workplace said that health-related officers at the centre had confirmed three cases of the probably fatal tropical condition, which is transmitted by mosquitoes.

Two of people affected by the sickness are possible refugees awaiting processing, while the other was a member of employees working at the centre, they said.

“All 3 folks have been isolated and are getting suitable treatment and are anticipated to make a full recovery,” a spokeswoman for Morrison stated in a statement.

But Sarah Hanson-Youthful, immigration spokeswoman for the Greens, stated that outbreaks are inevitable in crowded camps like the 1 on Nauru and known as for higher independent oversight of the overseas refugee detention method.

“The government can not management these types of outbreaks in the harsh detention camp surroundings. With seven households to a tent, it truly is unattainable to preserve youngsters safe from the ailment,” she said in a statement.

Australia uses detention centres in Nauru and on Manus Island in Papua New Guinea to procedure would-be refugees sent there after attempting to get to Australia, usually in unsafe boats soon after paying out people smugglers in Indonesia.

Canberra’s difficult stance on asylum seekers, such as offshore processing and a blanket ban on men and women arriving by boat ever settling in Australia, has been criticised by the United Nations and other groups as unlawful and inhumane.

The UN large commissioner for refugees in a November report stated neither centre had a “fair and effective system for assessing refugee claims” nor offered “safe and humane situations of treatment method in detention”.

Nauru in specific has come underneath fire following president Baron Waqa earlier this 12 months unilaterally sacked the nation’s complete judiciary, 1 factor of what critics have called a creeping authoritarianism there.

Critics say that Australia has been unusually silent about developments in Nauru in purchase to make certain that the camp, which is vital to its immigration policy, stays open.

In February, a riot at the detention centre on Manus Island in Papua New Guinea left at least one particular asylum seeker dead and 77 a lot more injured.

Nauru dengue fever outbreak sparks fresh worries about detention centre

Dengue fever: how to avoid it

Jane Rasch writes
Two friends who have recently visited an spot near Bangalore in South India have been informed that they have contracted dengue fever. I am organizing a go to to the very same region in two weeks’ time. There appears to be no preventive remedy for dengue fever, apart from steering clear of mosquito bites. Would it be safe to go ahead with the go to, or would you think about the threat as well substantial, and could you please advise the very best way of steering clear of this unpleasant disease?

Dr Richard Dawood, travel wellness skilled, replies
That is really poor luck, but if you are determined to keep away from all risk of dengue fever, you will have to cross more than a hundred nations off your list of areas to go. Dengue fever is a tropical virus infection spread by mosquitoes that bite for the duration of the day as effectively as for the duration of the night. It happens in a lot of elements of Asia, Africa and Latin America, the islands of the Caribbean, the Pacific and even the northernmost tip of Australia, and the southern reaches of the United States. Signs typically seem 5 to eight days soon after the infective bite with a sudden onset of fever and headache, with severe joint and muscle ache. Signs and symptoms may possibly persist for about 7 to 10 days in complete, however at times significantly longer. Dengue fever is normally an uncomplicated illness that needs only symptomatic treatment method. However, a subsequent infection with dengue viruses can result in critical problems that want specialised treatment method.

Building a excellent, risk-free, successful vaccine is a extremely higher priority, but in the meantime, cautious precautions actually do lessen the danger: cover up at occasions when mosquitoes are biting, use lots of DEET-based insect repellent on clothing and exposed skin and use mosquito coils, spray, a plug-in insect killer or a mosquito net at night. This kind of precautions must be schedule for all tropical travellers, not just simply because of the risk of dengue but to avert a wide assortment of other insect-borne illnesses. My advice: adhere to these precautions cautiously, and don’t cancel your trip.

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About Dr Richard Dawood

Richard is the health care director of the Fleet Street Clinic in London and has travelled in more than 100 countries. The fifth edition of his guide Travellers’ Wellness: How to Keep Healthful Abroad is due out in autumn.

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Dengue fever: how to avoid it

Preparing for a dengue fever vaccine: why Brazil"s ahead of the game

Dengue fever is now endemic in a lot more that 125 countries. 6 vaccines are currently in clinical growth and policymakers and worldwide wellness leaders need to be prepared for when they come on the industry.

The Planet Wellness Organisation (WHO) has known as dengue fever the quickest spreading vector-borne viral condition with “epidemic possible” and “staggering” consequences. In the previous 50 years, the amount of reported circumstances has enhanced thirty-fold. Whilst the WHO estimates that 50-a hundred million dengue infections happen each and every year, a new Nature examine calculated that virtually 400 million infections occurred in 2010 – four times as many as the official estimates.

Transmitted by mosquitoes, dengue is a painful sickness that triggers severe headache, muscle and joint discomfort, vomiting and skin rash. In some circumstances, it can lead to circulatory failure, shock, coma and death. But dengue’s impact goes beyond well being. Recent scientific studies on the affect of dengue place the financial expense at roughly US$ two.1 billion per year in the Americas and much more than US$ 950 million per 12 months in Southeast Asia. Despite these large figures, the true financial impact could be considerably worse when accounting for beneath-reported and misdiagnosed infections.

As dengue fever continues to spread and threaten the stability of overall health and financial programs, we have to accelerate efforts underway by governments, worldwide agencies, the pharmaceutical market, and partners in the scientific, academic and NGO communities.

While no vaccine is at the moment obtainable, notable progress has occurred. Around the world, six dengue vaccine candidates are in different phases of clinical growth, and several other folks are in preclinical phases. Establishing nations with large prevalence costs, interested in implementing a vaccine programme, must get started preparation now in buy to stay away from delays – as extended as a decade or a lot more – that could avoid the most in-want communities from getting these important interventions.

“One of the important lessons of the final several decades of vaccine advancement and introduction is that creating countries will not obtain the rewards of a new vaccine if organizing does not begin early,” mentioned Richard Mahony, former coordinator of policy and accessibility for the Dengue Vaccine Initiative (DVI), in a guide published last year to support countries with endemic dengue to put together for vaccines.

DVI, a consortium of the Global Vaccine Institute, WHO, Global Vaccine Entry Center of the John Hopkins University Bloomberg College of Public Well being, and Sabin Vaccine Institute, is operating to lay the needed groundwork to help creating nations consider and prepare for a dengue fever vaccine. DVI recommends that countries the place dengue is endemic put together for licensing selections, conduct surveillance and build immunisation, financing and communications methods. These steps will enable nations to introduce vaccines quicker and far more successfully.

With a current grant from the German Federal Ministry of Education and Research, DVI will collaborate with Instituto Butantan, a biomedical research centre in São Paulo, Brazil, and Vabiotech, a vaccine producer in Hanoi, Vietnam, to support the research and development of new dengue vaccines. This strategic partnership with regional makers is essential due to the fact it “will support make certain the availability and supply of much more dengue fever vaccines on the marketplace, which will assist increase access and affordability of the vaccines for individuals in greatest need”, explains Dr Georges Thiry, acting director of DVI.

The two Vietnam and Brazil are impacted by dengue fever. Vietnam reported over 60,000 cases of dengue fever in 2012, although Brazil reported above one.4 million instances by November 2013. Recently, issues about dengue fever in Brazil have produced even much more headlines than typical as frenzy over the Planet Cup, hosted in Brazil this summer time, intensifies a tremendous influx of individuals in dengue-endemic locations could be problematic.

Nevertheless, Vietnam and Brazil are dedicated to identifying remedies and operating with a broad variety of public and personal partners. For instance, Vietnam is pursuing both vaccine advancement and novel vector handle management, such as the use of naturally taking place Wolbachia bacteria-infected mosquitoes, to manage the illness. This approach is getting explored due to the fact Wolbachia-contaminated mosquitoes can not carry the dengue virus. Meanwhile, Brazil’s ministry of well being is working with the Pan American Overall health Organisation, conducting research, strengthening surveillance and also exploring novel management methods such as Wolbachia.

Partners need to act now, and collectively, to halt the spread of dengue fever. By way of immediate and extended-term answers, such as more rigorous surveillance, increased vector handle – controlling mosquitoes in the environment by way of insecticide spraying and emptying of containers that collect rainwater – and new vaccines, we can decrease the devastation that dengue fever threatens us with.

Dr Ciro de Quadros is the executive vice president of the Sabin Vaccine Institute. Stick to @preventdengue on Twitter

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Preparing for a dengue fever vaccine: why Brazil"s ahead of the game