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Table II.

Effect of Neospora caninum infection on dams and litter size.

N. caninum infected mice group (and control group) No. of pregnant dams at day 14 of gestation (%) No. of clinically affected pregnant dams (nervous signs) No. of PCR-positive dams (%) Litter size (average ± SD)
Nc-Spain 2H 11/24 (45.8)a Hb 3/11 (27.2)d 4.9 ± 1.8
Nc-Spain 3H 14/22 (63.6) H 11/14 (78.5) 6 ± 1.6
Nc-Spain 4H 12/22 (54.5) 12/12 (100%)c 11/12 (91.6)1 5.5 ± 1.3
Nc-Spain 5H 18/22 (81.8) 5/18 (27.7%) 18/18 (100)1 4.8 ± 2.3
Nc-Spain 6 12/22 (54.5) H 3/12 (25) 4.9 ± 2.1
Nc-Spain 7 13/22 (59) 4/13 (30.7%) 9/13 (69.2) 5.6 ± 1.3
Nc-Spain 8 19/24 (79.1) H 5/19 (26.3)2 5.2 ± 1.5
Nc-Spain 9 10/24 (41.6) H 1/10 (10)2 5.1 ± 1.2
Nc-Spain 10 13/22 (59) H 11/13 (84.6) 5.9 ± 1.6
Nc-Liverpool 8/24 (33.3) 5/8 (62.5%) 8/8 (100)1 4.8 ± 2.4
Control 18/22 (81.8) H 0/10 (0)e 5.3 ± 1.7

Nc-Spain 4H data were collected at day 20 PP when dams were sacrificed.

a,c,d

Number of pregnant dams, number of clinically affected dams, and number of PCR-positive dams, according to superscript/number of total female mice.

b

Healthy. No clinical signs were detected in pregnant mice.

e

Ten female mice and their offspring were randomly selected as a control group to evaluate the presence of parasites in the dams’ brain and vertical transmission.

1,2

Percentages determined for infected groups followed by unlike superscripts differ significantly by χ2 multiple-comparison test.