Leptospira seroprevalence and associations between seropositivity, clinical disease and host factors in horses

Table 4 Number of serum samples from 2017 horses^a (healthy [n = 400] and non-healthy horses^b [n = 1617]) with titres to five Leptospira serovars obtained by microscopic agglutination test

	Number (%) of positive horses at each titre
	Seropositive^c		1:100		1:200		1:400		1:800		1:1600		1:3200
Serovar	n	%	n	%	n	%	n	%	n	%	n	%	n	%
Bratislava	335	16.6	274	81.8	54	16.1	6	1.8	0	0	0	0	1	0.3
Healthy horses	65	16.3	49	75.4	14	21.5	2	3.1	0	0	0	0	0	0
Non-healthy horses	270	16.7	225	83.3	40	14.8	4	1.5	0	0	0	0	1	0.4
Icterohaemorrhagiae	168	8.3	101	60.1	41	24.4	16	9.5	7	4.2	2	1.2	1	0.6
Healthy horses	9	2.2	6	66.7	2	22.2	0	0	1	11.1	0	0	0	0
Non-healthy horses	159	9.8	95	59.7	39	24.5	16	10.1	6	3.8	2	1.3	1	0.6
Grippotyphosa	8	0.4	4	50.0	4	50.0	0	0	0	0	0	0	0	0
Pomona	11	0.5	8	72.7	0	0	3	27.3	0	0	0	0	0	0
Sejroe	24	1.2	15	62.5	5	20.8	3	12.5	0	0	0	0	1	4.2

^aHorses were sampled during September 1997–98 from clinics associated with the Swedish Horserace Totalizator Board.
^bHorses were grouped as healthy and non-healthy when the seroprevalence exceeded 8% at a cut-off 1:100. ^cAll horses with a titre ≥ 1:100

ISSN: 1751-0147