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Table 1 Mosquito pools and their positivity for Dirofilaria spp. according to mosquito species, sampling month and province

From: Dirofilaria immitis and Dirofilaria repens in mosquitoes from Corsica Island, France

Variables

Specimens (n; m; k; SE)

Dirofilaria immitis

Dirofilaria repens

Positive pools

MIR

EIR

P-value P-valuea

Positive pools

MIR

EIR

P-value P-valuea

Mosquito species

 Ochlerotatus caspius

(1432; 77; 18.6; 0.5)

6

0.4

0.4

ref.

2

0.1

0.1

ref.

 Aedes albopictus

(199; 15; 13.3; 2.2)

6

3.0

3.8

0.0001

0

na

na

0.707

 Aedes vexans

(6; 3; 2.0; 0.6)

0

na

na

0.757

0

na

na

0.566

 Culex pipiens

(165; 14; 11.8; 2.1)

1

0.6

0.6

0.207

1

0.6

0.6

0.125

Sampling month

 September

(1496; 83; 18; 0.6)

8

0.5

0.6

ref.

2

0.1

0.1

ref.

 July

(139; 12; 11.6; 2.3)

3

2.2

2.5

0.406

0

na

na

0.701

 June

(167; 14; 11.9; 2.5)

2

1.2

1.3

0.829

1

0.6

0.6

0.197

Province

 Solaro

(1606; 83; 19.4; 0.3)

12

0.7

0.8

ref.

3

0.2

0.2

ref.

 Aleria

(83; 9; 9.2; 3.1)

0

na

na

0.084

0

na

na

0.092

 Solenzara

(88; 9; 9.8; 2.6)

1

1.1

1.2

0.211

0

na

na

0.232

 Borgo

(25; 8; 3.1; 0.8)

0

na

na

0.025

0

na

na

0.192

Global infection rate

(1802; 109; 11.4; 0.7)

13

0.7

1.1

na

3

0.2

0.2

na

Statistics

 

ANCOVA: R2(100) = 0.193

ANCOVA: R2(100) = 0.064

 

ANCOVA: F(8,108) = 2.993, Pb = 0.005

ANCOVA: F(8,108) = 0.861, Pb = 0.552

  1. ANCOVA statistics are also reported along with the percentage of minimum infection rate (MIR) and estimated rate of infection (ERI)
  2. n, number of mosquito specimens; m, number of mosquito pools; k, average number of specimens per pools; SE, standard error; ref, fixed reference group for ANCOVA analysis; na, not applicable
  3. aP-value calculated with Student’s t-test within ANCOVA model for the effect of individual factors (i.e., mosquito species, sampling month and province) on Dirofilaria spp. infection
  4. bP-value calculated with Fisher test within ANCOVA model for the global effect of grouped factors (i.e., mosquito species, sampling month and province) on Dirofilaria spp. infection