Table 1.

Serological results of 3885 dog serum samples from Sweden tested for the presence of circulating antigens of Angiostrongylus vasorum and of specific antibodies to A. vasorum

	Positive samples (n)	%	95% confidence intervals
Antibody-positive	38	0.98	0.69–1.34
Antibody-positive only	34	0.88	0.61–1.22
Antigen positive	24	0.62	0.40–0.92
Antigen positive only	20	0.51	0.31–0.79
Antibody and antigen positive	4	0.10	0.03–0.26