Results
The overall prevalence of animals testing positive to BCV
and BRSV was 43.1 (95% CI: 41.3-45.0) and 39.2% (95%
CI: 37.3-41.0) respectively. There was a statistically significant
(P < 0.01, χ2-test) relationship between BCV and
BRSV serological status, i.e. BCV-positive animals were
more likely to be BRSV-positive and vice versa. Animals
testing positive to BCV were predominately located in
the central-western and southern Sweden, as well as in
some northern areas (Figure 1a). Animals testing positive
to BRSV were predominately found in the same centralwestern
and southern parts of the country (Figure 2a).
When the prevalences were adjusted by SEB, these tendencies
became even clearer (Figures 1b and 2b) and the
northern areas were no longer considered having high
prevalences for BCV.
The findings were confirmed by significant Moran's I
tests for both infections (0.15, P = 0.0001 for BCV; 0.16, P
= 0.001 for BRSV), suggesting that the test positive animals
were not randomly distributed throughout the
country.
Using the spatial scan statistic with elliptic clusters and
a maximum cluster size of 10% of the population at risk
identified two areas with higher prevalence of BCV than
expected: Skaraborg (central-south part of Sweden) and
Skåne (extreme south), as well as one area with lower
prevalence than expected: Kronoberg-Blekinge (southeast
of Sweden; Figure 3a). Almost the same high prevalence
areas (Skaraborg and Skåne) were identified as
being clusters for BRSV. Two areas with low prevalence of
BRSV were also detected: Kronoberg-Blekinge and
ResultsThe overall prevalence of animals testing positive to BCVand BRSV was 43.1 (95% CI: 41.3-45.0) and 39.2% (95%CI: 37.3-41.0) respectively. There was a statistically significant(P < 0.01, χ2-test) relationship between BCV andBRSV serological status, i.e. BCV-positive animals weremore likely to be BRSV-positive and vice versa. Animalstesting positive to BCV were predominately located inthe central-western and southern Sweden, as well as insome northern areas (Figure 1a). Animals testing positiveto BRSV were predominately found in the same centralwesternand southern parts of the country (Figure 2a).When the prevalences were adjusted by SEB, these tendenciesbecame even clearer (Figures 1b and 2b) and thenorthern areas were no longer considered having highprevalences for BCV.The findings were confirmed by significant Moran's Itests for both infections (0.15, P = 0.0001 for BCV; 0.16, P= 0.001 for BRSV), suggesting that the test positive animalswere not randomly distributed throughout thecountry.Using the spatial scan statistic with elliptic clusters anda maximum cluster size of 10% of the population at riskidentified two areas with higher prevalence of BCV thanexpected: Skaraborg (central-south part of Sweden) andSkåne (extreme south), as well as one area with lowerprevalence than expected: Kronoberg-Blekinge (southeastof Sweden; Figure 3a). Almost the same high prevalenceระบุเป็นพื้นที่ (Skaraborg และสโกเน)การคลัสเตอร์สำหรับ BRSV พื้นที่ที่สอง มีส่วนต่ำสุดนอกจากนี้ยังพบ BRSV: Kronoberg-Blekinge และ
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