Prevalence of dengue, Zika and chikungunya viruses in Aedes (Stegomyia) aegypti (Diptera: Culicidae) in a medium-sized city, Amazon, Brazil.

Prevalence of dengue, Zika and chikungunya viruses in Aedes (Stegomyia) aegypti (Diptera: Culicidae) in a medium-sized city, Amazon, Brazil. Rev Inst Med Trop Sao Paulo. 2020;62:e10 Authors: Monteiro FJC, Mourão FRP, Ribeiro ESD, Rêgo MODS, Frances PADC, Souto RNP, Façanha MDS, Tahmasebi R, Costa ACD Abstract Aedes aegypti is associated with epidemic diseases in Brazil, such as urban yellow fever, dengue, and more recently, chikungunya and Zika viruses infections. More information about Ae. aegypti infestation is fundamental to virological surveillance in order to ensure the effectiveness of control measures in use. Thus, the present study aims to identify and compare infestation and infectivity of Ae. aegypti females in Macapa city, Amapa State (Amazon region), Brazil, between the epidemiological weeks 2017/02 and 2018/20. A total number of 303 Ae. aegypti females were collected at 21 fixed collection points, 171 at the 10 collection points in the Marabaixo neighborhood and 132 at the 11 collection points in the Central neighborhood. Among the collected samples, only two were positive for dengue virus, with a 2.08% (2/96 pools) infectivity rate for Marabaixo. The difference between the medians of Ae. aegypti females captured in Central and Marabaixo sites was not statistically significant. The findings indicate similar mosquito infestation levels between the neighborhoods, and a low-level of mosquito infectivity, although dengue viru...
Source: Revista do Instituto de Medicina Tropical de Sao Paulo - Category: Tropical Medicine Authors: Tags: Rev Inst Med Trop Sao Paulo Source Type: research

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Conclusion: These results suggest that if no vector control measures are considered to be in place, the risk of new arboviral outbreaks in Cabo Verde is high. The vector control strategy adopted must include measures of public health directed to domestic water storage and management.
Source: International Journal of Environmental Research and Public Health - Category: Environmental Health Authors: Tags: Article Source Type: research
Discussion Dengue is an important arboviral infection that affects about 40% of the world population. It is found mainly in topical and subtropical areas of the world mainly in developing countries but it range is spreading including the United States. A review of common arboviruses can be found here. It is a flaviavirus with 4 distinct serotypes named DENV-1 through DENV-4 and is spread by A. aegypti a day biting mosquito. Infection with one serotype confers immunity to that serotype but not the others. It does offer some protection for cross-infection but this only lasts a few months. Incubation period is 3-14 days with ...
Source: PediatricEducation.org - Category: Pediatrics Authors: Tags: Uncategorized Source Type: news
The present study shows that the most prominent human arboviruses worldwide (dengue viruses 1, 2, 3, and 4, Chikungunya virus, and Zika virus) can infect wild animals and jump from urban to sylvatic maintenance cycles in South America, as did the yellow fever virus in the past. All these viruses are transmitted by the anthropophilic mosquito Aedes aegypti and cause epidemics throughout Brazil. The yellow fever virus is the oldest example of an urban arbovirus that became sylvatic in South America. Currently, the disease is a zoonosis of non-human primates that moves like a wave through forests of the Brazilian countryside,...
Source: Frontiers in cellular and infection microbiology - Category: Microbiology Source Type: research
This study shows spatiotemporal variability in IR inAe.aegypti populations in southern coastal Ecuador, and provides an initial examination of IR in this region, helping to guide vector control efforts forAe.aegypti.
Source: PLoS Neglected Tropical Diseases - Category: Tropical Medicine Authors: Source Type: research
This study lays critical groundwork for pursuing ZIKV transmission-blocking strategies that exploit the Ae. aegypti exo-siRNA response for arbovirus suppression in natural populations. PMID: 31103782 [PubMed - as supplied by publisher]
Source: Insect Biochemistry and Molecular Biology - Category: Biochemistry Authors: Tags: Insect Biochem Mol Biol Source Type: research
Adriano Queiroz1, Isabella Fernanda Dantas Pinto2, Maricélia Lima3, Marta Giovanetti1,4, Jaqueline Goes de Jesus1, Joilson Xavier1, Fernanda Khouri Barreto5, Gisele André Baptista Canuto6, Helineide Ramos do Amaral7, Ana Maria Bispo de Filippis4, Denise Lima Mascarenhas8, Melissa Barreto Falcão8, Normeide Pedreira Santos8, Vasco Ariston de Carvalho Azevedo9, Marcos Yukio Yoshinaga2*, Sayuri Miyamoto2 and Luiz Carlos Junior Alcantara1,4,10* 1Laboratório de Patologia Experimental, Instituto Gonçalo Moniz, Salvador, Brazil 2Departamento de Bioquímica, Instituto de Quími...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Conclusions Apart West Nile virus (78), thousands of congenital microcephaly cases, fetal brain tissue damage and neurological syndromes have been associated with ZIKV infection. Unfortunately, the epidemics of this mosquito born, and a relative stable virus is on a rise. Although congenital microcephaly is a rare disorder however, due to lack of standardized diagnostic test facilities, the incidence in the geographically widespread ZIKV epidemic regions is higher. Animals studies showed that ZIKV is a neurotropic virus. It directly targets the developing embryonic brain cells by inducing apoptosis, cell-cycle arrest, and...
Source: Frontiers in Neurology - Category: Neurology Source Type: research
Conclusion and Perspectives Arbovirus infections, such as CHIKV, have been growing worldwide and are becoming a major public health problem, especially in immuno-compromised classes such as children and the elderly. CHIKV is dangerous since it can cause arthritis, fever and other impairments, making it necessary to seek new ways to counter the proliferation of this virus. Knowing the vector’s competence is fundamentally important, including an understanding of the vector virus interaction and the modulation of this interaction. Despite advances in the knowledge of mosquito competence in the transmission of CHIKV, li...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Purpose: The dangerous diseases: dengue fever, yellow fever, Zika virus and Chikungunya, which affect hundreds of millions of people each year, are transmitted by female Aedes mosquitoes. To prevent the spreading of the Aedes mosquitoes, the Aedes larvae should be under close surveillance, so that the responsible agencies can make a warning or prepare for the epidemic. In order for anyone without the expert knowledge to detect and report the existence of the Aedes larvae, which are very responsive to the change of light intensity and move abruptly, we propose the Aedes Larvae Surveillance System using Smartphones.
Source: International Journal of Infectious Diseases - Category: Infectious Diseases Authors: Tags: 21.066 Source Type: research
In recent years, Brazil has experienced several epidemics caused by arboviruses, such as dengue virus (DENV serotypes 1 –4), Zika virus (ZIKV), chikungunya virus (CHIKV), and yellow fever virus (YFV). In the past 2 years, the largest epidemic of sylvatic yellow fever in decades occurred in areas that were not considered at risk (Faria et al., 2018). As part of the response to this recent outbreak, federal and state authorities conducted mass vaccination campaigns against YFV, and the vaccination is now recommended and offered in 19 Brazilian states (Saúde, 2018b).
Source: International Journal of Infectious Diseases - Category: Infectious Diseases Authors: Tags: Short Communication Source Type: research
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