Occurrence and phylogenetic analysis of bovine respiratory syncytial virus in outbreaks of respiratory disease in Norway

Table 2 Serological results from animals in herds with outbreak of respiratory disease

Herd size	Herd no.	Mean age of sampled animals	BRSV infection No. pos/sampled	BPIV3 infection No. pos/sampled	BCoV infection No. pos/sampled	Serological detection
13	20	3.9 yrs	5/5	0/5	0/5	BRSV
20	1	2.3 yrs	1/2	0/2	0/2	BRSV
24	21	3.5 yrs	3/3	0/3	0/3	BRSV
27	16	3.0 mo	4/5	0/5	0/5	BRSV
51	6	2.2 mo	1/5	0/5	0/5	BRSV
55	4	1.2 yrs	7/7	0/7	0/7	BRSV
71	7	1.2 yrs	6/7	0/7	0/7	BRSV
74	3	1.7 mo	0/4	0/4	4/4	BCoV
83	11	7.3 mo	3/5	0/5	0/5	BRSV
95	14	3.8 mo	1/3	0/3	0/3	BRSV
136	13	4.8 mo	3/3	0/3	1/3	BRSV/BCoV
171	8	10.5 mo	6/6	0/6	0/6	BRSV
193	18	7.1 mo	4/5	4/5	2/5	BRSV/BPIV3/BCoV
210	10	5.5 mo	5/5	0/5	0/5	BRSV
210	15	3.7 mo	5/5	0/5	1/5	BRSV/BCoV
220	19	2.7 mo	0/5	0/5	1/5	BCoV
250	12	5.7 mo	0/3	2/3	0/3	BPIV3
256	5	1.4 mo	0/5	0/5	0/5	-
265	17	4.7 mo	5/6	2/6	5/6	BRSV/BPIV3/BCoV
300	9	1.6 yrs	5/5	3/5	1/5	BRSV/BPIV3/BCoV
Total			64/94	11/94	15/94

The herds are listed according to size, i. e. the number of animals in the herds at first sampling. The ratio of animals with acute antibody response against BRSV, BPIV3 and/or BCoV out of investigated animals is shown.
The results are based on detection of antibodies in paired serum samples. Animals were defined as positive for infection if they seroconverted or if the antibody titre increased ≥ 70%. The mean age is at first sampling.

ISSN: 1746-6148