Aedes aegypti (Linnaeus) is the main vector of most arboviruses in tropical and subtropical urban areas. In West Africa, particularly in Senegal, domestic and wild populations have been described. Both Ae. aegypti aegypti (Aaa) and Ae. aegypti formosus (Aaf) were found in progenies of Ae. aegypti families from several localities of Senegal. However, nothing is known about their resting and trophic behavior, which are key data for vector control. To fill this gap, blood-fed mosquitoes were collected monthly indoors and outdoors with BackPack aspirators and BG-Sentinel 2 traps between July and November 2019 from four urban sites. The enzyme-linked immunosorbent assay technique was used to analyze blood-fed Aaa and Aaf specimens. Both forms were found resting in all investigated places with the highest proportions found in scrap metals (51.7% for Aaa and 44.1% for Aaf) and used tires (19.2% for Aaa and 26.1% for Aaf). Blood-fed Aaf females showed lower occupation of the indoors environment compared to Aaa. Overall, the percentages of single bloodmeals from human were 80.5% (916/1138) for Aaa and 71.1% (263/370) for Aaf. A low frequency of other domestic hosts, including bovine, ovine, and cat were detected for both forms. This study provides the first data on resting and trophic behavior of Aaa and Aaf in Senegal. Both forms showed differences in their resting behavior but fed primarily on human and highlight the risk of arboviruses transmission in urban areas.
Background: The first case of Covid-19 was notified in Senegal on March 2, 2020. One month after, this study aims to analyze the trend and the main measures that have been taken.Methods: Data sources are from the Department of Disease Prevention in Senegal and some administrative documents. The epidemic trend has been described through epidemic curves according to the characteristics of infected people.Results: Of the 195 patients tested positive for COVID-19, a proportion of 53.8% is female. Six out of 14 regions were affected by the epidemic on April 1, 2020. The mean age is 37.9 years with a standard deviation of 18.6 years. The proportion of imported cases is 39.5%. The major strategy in Senegal is based on the isolation of cases for treatment and tracking of contacts. Decisions have been made to limit spread of the virus through social distancing. Airlines have been closed and border control strengthened.Conclusions: The preparation and the measures taken made it possible to contain the pandemic during the first month. However, there is a need to strengthen the surveillance following the appearance of community-based cases and readjust strategies to hope to contain the pandemic during the second month.
Background
The first case of Covid-19 was notified in Senegal on March 2, 2020. One month after, this study aims to analyze the trend and the main measures that have been taken.
Methods
Data sources are from the Department of Disease Prevention in Senegal and some administrative documents. The epidemic trend has been described through epidemic curves according to the characteristics of infected people.
Results
Of the 195 patients tested positive for COVID-19, a proportion of 53.8% is female. Six out of 14 regions were affected by the epidemic on April 1, 2020. The mean age is 37.9 years with a standard deviation of 18.6 years. The proportion of imported cases is 39.5%. The major strategy in Senegal is based on the isolation of cases for treatment and tracking of contacts. Decisions have been made to limit spread of the virus through social distancing. Airlines have been closed and border control strengthened.
Conclusions
The preparation and the measures taken made it possible to contain the pandemic during the first month. However, there is a need to strengthen the surveillance following the appearance of community-based cases and readjust strategies to hope to contain the pandemic during the second month.
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