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Table 2 Rodent captures, on-rodent flea abundance, rodent flea infestation and flea index at intervention and control villages before and during intervention

From: Community-led intensive trapping reduces abundance of key plague reservoir and flea vector

Parameters

Pre-intervention

Intervention

Intervention villages

Control villages

Intervention villages

Control villages

Reduction rated

Rattus rattus capturesa

11.33 ± 1.33

(34)

10.33 ± 3.48

(31)

3.78 ± 0.8

(34)

11.56 ± 2.87

(104)

− 67

Mus musculus capturesa

4.67 ± 0.88

(14)

5.67 ± 1.76

(17)

8.78 ± 2.68

(79)

9.67 ± 2.26

(87)

− 9

Infestation of Xenopsylla cheopis on ratsb

0.54 ± 0.06

0.67 ± 0.04

0.12 ± 0.05

0.32 ± 0.05

− 63

Infestation of Synopsyllus fonquerniei on ratsb

0.19 ± 0.12

0.13 ± 0.07

0.16 ± 0.05

0.12 ± 0.04

28

Xenopsylla cheopis abundance on ratsb

53.67 ± 30.72

(161)

47.67 ± 22.42

(143)

1.44 ± 0.88

(13)

7.0 ± 1.38

(63)

− 79

Synopsyllus fonquerniei abundance on ratsb

4.67 ± 3.28

(14)

2.67 ± 1.45

(8)

1.0 ± 0.53

(9)

1.44 ± 0.44

(13)

− 31

Total flea index on ratsc

4.71 ± 1.92

5.05 ± 1.89

0.48 ± 0.20

0.89 ± 0.20

− 46

  1. aRodent (Rattus rattus and Mus musculus) captures during pre-intervention period took place in March 2022 and during intervention period took place in July 2022, November 2022 and March 2023. Data are presented as the average captures across all sites and sampling months ± standard error, and the total number in brackets
  2. bCollection of Xenopsylla cheopis fleas on rodents during pre-intervention took place in March 2022, and collection of Synopsyllus fonquerniei fleas during pre-intervention took place in August or October 2021. Intervention period sampling took place in July 2022, November 2022 and March 2023. Only data for rats are presented as few fleas were collected from mice (n = 20 in total). Rodent flea infestation is the proportion of rodents that carry fleas (probability of being infested with fleas), with data presented as the average across all sites and sampling months ± standard error. Flea abundance data are presented as the average abundance across all sites and sampling months ± standard error, and the total number in brackets. High abundance of X. cheopis in the pre-intervention period in one intervention village and one control village contributes to high average values and standard errors
  3. cFlea index = total number of fleas/number of rats. Data are presented as the average across all sites and sampling months ± standard error
  4. dReduction rate = percentage change in captures, flea infestation, flea abundance and flea index at intervention sites compared to control sites during intervention period using the average values. It was calculated as ((intervention—control)/control)*100