The FOI is an important public health parameter for measuring the weight or the burden of disease and the effect of outbreak management programs. sera, one (0.39%) tested RVFV IgM positive, while fifty-three (20.78%) tested positive for RVFV IgG. For animal monitoring, out of 30 sheep recorded and sampled over the study period, 20 (66.67%) showed seroconversion to RVFV IgG antibodies, notably during the rainy time of year. The presence of antibodies increased significantly with age in both organizations (p< 0.05), as the force of RVF illness (FOI), increased by 16.05% per year for humans and by 80.4% per month for livestock sheep. This study supports the usefulness of setting up a One Health survey for RVF management. Keywords:Rift Valley Fever Computer virus, survey, humans, livestock, northeastern Senegal == 1. Introduction == Rift Valley Fever Computer virus (RVFV) is an arthropod-borne computer virus belonging to thePhlebovirusorder in thePhenuiviridaefamily which infects humans and animals, including animal livestock. The computer virus is usually transmitted mainly by infected mosquito bites during a blood meal, yet humans can also acquire RVFV contamination through contact with an infected animal or handling of contaminated animal products, as well as in the healthcare establishing during the care of infected patients [1]. RVF was first documented in 1930 in the Rift Valley region of Kenya in East Africa [2]; the disease has since been reported throughout Africa and the Arabic peninsula, and the diffusion is likely attributed to livestock trade. In 1987, RVFV emerged in Mauritania and caused the first RVFV outbreak in West Africa [3]. Due to the high risk of RVF introduction by livestock trade with neighboring Mauritania, Senegals northern regions are the most uncovered. In Senegal, serological and molecular evidence of RVFV blood circulation has been reported in humans, livestock, and mosquitoes [4,5,6,7,8,9,10,11].Aedes vexans,Culex quinquefasciatus,andCulex poicilipescan transmit the disease [12]. In humans, after contamination and a few days of incubation, clinical signs and symptoms such as fever, headache, backache, vertigo, anorexia, and photophobia appear. MLN4924 (HCL Salt) In a few cases, additional severe clinical manifestations can appear, including hepatitis, jaundice, further neurological disease, and hemorrhagic disease [13]. RVFV infects a wide range of animals with indicators including fever, bloody diarrhea, and abortion, as well as behaviors indicative of listlessness, loss of appetite, disinclination to move, MLN4924 (HCL Salt) and abdominal pain [13]. A differential influence of age on mortality was reported, with juveniles more susceptible to severe outcomes than adults [13]. RVFV remains detectable by reverse transcription real-time polymerase chain reaction (RT-PCR) 10 days after symptom onset. Antibody levels start to increase at day four (4) after symptom onset for immunoglobulin M (IgM) and on day seven (7) after symptom onset for immunoglobulin G (IgG). These antibodies remain detectable by serological assay for at least MLN4924 (HCL Salt) forty-two (42) days for IgM and several years for IgG [14]. The RVFV genome is usually a ribonucleic (RNA) genome that is composed of three segments: small (S), medium (M), and large (L). The S segment encodes the nucleocapsid (N) protein and non-structural proteins (NS), which are translated from overlapping open reading frames (ORF). The M segment encodes for the glycoproteins (Gn and Gc) and a non-structural protein (NSm). Lastly, the L segment encodes the RNA-dependent RNA polymerase (RDRP) [15]. Several commercialized vaccines are available to protect against RVFV contamination, including the live attenuated MP-12 and the inactivated vaccine TSI-GSD-200 for human immunization [16], as well as the ancestral live attenuated vaccine Smithburn strain and the newly developed live attenuated vaccine Clone 13 for livestock animal vaccination [17]. Even so, thus far, no specific pharmaceutical treatment for RVF exists, which prompts an urgency to assess the blood circulation of the disease. Here we used a One Health site to assess the blood circulation of RVFV in Agnam, an area near Mauritania at risk of contamination in animals and humans related to the importation of infected livestock. == 2. Materials and Methods == == 2.1. Study Sites == This survey was established in the Matam region (150618 N and 133830 W), more particularly in Agnam, in the villages located around Agnam Civol (160018 N, 134135 W) and Idite (155509.5 N 134305.1 W) (Figure 1). These Sudano-Sahelian Efnb2 areas are located in the northeast of the country on the border of Mauritania with an estimated populace of 654,951 inhabitants. Within Agnam, Agnam Civol constitutes the urban environment, which includes markets and hospitals. In contrast, Idite contains pastoral activities such as grazing and livestock breeding. == Physique 1. == Study sites (Idite for animal survey represented by the MLN4924 (HCL Salt) black dot and Agnam Civol for human survey represented by the reddish dot) located.