In short, the job alert for favorable conditions for mosquito-borne diseases to spread around the world. Besides the zika, the study also talks about the yellow fever and the virus mayaro
The authors are two virologists, Scott C. Weaver and William K. Reisen. Mechanisms that they address is the geographic expansion of certain species of mosquitoes. They state that, over time, this expansion should be more and more common. Among the main factors for this to happen are the deforestation of forest areas and greater mobility around the world. Passenger travel and cargo transportation could allow the mosquito vectors to spread.
Another factor cited by the authors for these diseases become more common is global warming. According to them, the favorable periods for reproduction of insect vectors increase - also expanding the peak times of disease.
The greatest risk, however, is due to the transmission of extremely efficient vectors in urban environments. At the time, zika was not associated with it, despite the possibility of transmission by Aedes aegypti.
"There are reasons to believe that additional viruses have the potential to urbanization, which could have devastating consequences for public health, especially in the western world where we do not have cases of immunity," the authors write.
"Combined with the explosion of the human population in urban areas in the tropics, the incidence of diseases such as dengue and chikungunya will continue to increase until vaccines or better control tools such vectors in urban environments to be created," the scientists write.
After work, experts also suggest studies to understand how other viruses had not yet spread throughout the world. They claim that this would help in the development of strategies to facilitate and prevent urban outbreaks of new viruses.
other threats
The other two viruses cited in the study are yellow fever and mayaro virus. Yellow fever is an old acquaintance of the Western world. Disease outbreaks have been recorded since the sixteenth century. By the early twentieth century, the disease hit mainly port cities of North and South America.
Mayaro was first isolated in 1954 in Trinidad. According to the work, it causes symptoms similar to dengue them, such as fever, headaches and eye pain.
According to experts, many cases of infection mayaro virus are mistaken for dengue lack of laboratory tests to confirm the disease. A considerable difference with dengue is that mayaro is much more persistent. Joint pain can incapacitate the patient for weeks or months - a much more severe picture than dengue.
Scientists warn of evidence that may have mayaro outbreaks in urban environments. It is extremely close to the chikungunya (which has already submitted Urban Affairs), common occurrence in nearby urban areas with large numbers of Aedes aegypti and, finally, the possibility that Aedes becomes an virus transmission vector.
"The epidemic of chikungunya activity should serve as a warning that obscure viruses like mayaro can not be underestimated as potential emerging pathogens," says the document.
Nenhum comentário:
Postar um comentário