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Table 1

Yearly serological and parasitological prevalences of animal trypanosomosis in the Niayes area from 2009 to 2022 and number of PCR-positive samples from 2020 to 2022; *CI = confidence interval.

Year Site Number of samples Number of seropositive samples Apparent seroprevalence (%) True seroprevalence (%) 95% CI of the true seroprevalence (%) Number of samples positive in buffy coat test Parasitological prevalence (%) Number of PCR-positive samples
2009 Pout 126 75 59.5 63.1 54.6–71.6 N/A N/A N/A
Kayar 102 21 20.6 18.9 11.2–26.5 N/A N/A N/A
Tassette 132 7 5.3 1.5 0.0–3.6 N/A N/A N/A
2010 Pout 119 102 85.7 92.9 88.2–97.5 N/A N/A N/A
Kayar 101 16 15.8 13.5 6.8–20.2 N/A N/A N/A
Tassette 133 1 0.8 0 0.0–0.0 N/A N/A N/A
2011 Pout 114 50 43.9 45.3 36.1–54.5 0 0 N/A
Kayar 97 3 3.1 0 0.0–0.1 0 0 N/A
Tassette 94 3 3.2 0 0.0–0.1 5 4.4 N/A
2012 Pout 105 19 18.1 16 9.0–23.1 0 0 N/A
Kayar 76 3 3.9 0 0.0–0.1 3 3.9 N/A
2013 Pout 111 12 10.8 7.7 2.7–12.8 2 1.8 N/A
Kayar 89 2 2.3 0 0.0–0.1 3 3.4 N/A
Thiénaba 100 1 1 0 0.0–0.1 0 0 N/A
2014 Pout 112 9 8 4.6 0.7–8.5 2 1.8 N/A
Kayar 102 1 0.98 0 0.0–0.0 4 3.0 N/A
Thiénaba 100 1 1 0 0.0–0.1 1 1 N/A
2015 Pout 103 17 16.5 14.2 7.4–21.0 0 0 N/A
Kayar 86 11 12.8 10 3.6–16.4 0 0 N/A
Thiénaba 96 3 3.1 0 0.0–0.1 0 0 N/A
2016 Pout 116 8 6.9 3.3 0.0–6.6 0 0 N/A
Kayar 100 1 1 0 0.0–0.1 0 0 N/A
Thiénaba 199 9 4.5 0.6 0.0–1.7 0 0 N/A
2017 Pout 129 9 7 3.4 0.2–6.5 0 0 N/A
Kayar 94 0 0 0 0.0–0.1 0 0 N/A
Thiénaba 100 1 1 0 0.0–0.1 0 0 N/A
2018 Pout 103 9 8.7 5.4 1.0–9.8 0 0 N/A
Kayar 103 0 0 0 0.0–0.0 2 1.9 N/A
Thiénaba 100 2 2 0 0.0–0.1 0 0 N/A
2019 Pout 99 10 10.1 6.9 1.9–12.0 1 1 N/A
Kayar 74 0 0 0 0.0–0.1 0 0 N/A
Thiénaba 118 7 5.9 2.2 0.0–4.9 0 0 N/A
2020 Pout 99 15 15.2 12.7 6.1–19.3 0 0 1
Kayar 102 10 9.8 6.6 1.7–11.5 0 0 0
Thiénaba 100 8 8 4.5 0.4–8.7 0 0 0
2021 Pout 99 1 1 0 0.0–0.1 0 0 0
Kayar 105 0 0 0 0.0–0.0 0 0 0
Thiénaba 102 1 1 0 0.0–0.0 0 0 0
2022 Pout 121 3 2.5 0 0.0–0.0 0 0 0
Kayar 96 0 0 0 0.0–0.1 0 0 0
Thiénaba 100 1 1 0 0.0–0.1 0 0 0

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