分类图
2024-05-14 17:23:47 0 举报AI智能生成
这个分类图清晰地展示了各种文件类型及其对应的修饰语。如图所示，文件类型包括PDF、Word、Excel和PowerPoint等，而修饰语则包括“机密”、“内部”、“正式”、“草稿”、“过期”等。这种分类方式有助于快速识别和管理不同文件的重要性和状态。
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Study Subjects
Only farms with 100 or fewer pigs were included
Classified as commercial and non-commercial
Primary outbreaks were included, excluding secondary cases
Case and Control Matching
Two pig farms without an outbreak are selected as controls
Matched according to location, herd size and breeding type
Maximum distance between case and control farms was defined as 25 km
Selection of Control Farms
Online map tool used to measure distance from case farm to adjacent farm
Two farms that met required criteria and were closest to case farm selected
Data Collection Method
Face-to-face interviews conducted by veterinarians from emergency department
Visits to case farms are usually conducted on day of culling or day before
Visual inspections at control farms without entering pen
Data Verification
Data is verified by two people before being used for statistical analysis
Double checking
Data Collection
Collect risk factor data through questionnaires
Includes herd information, pig farm management, biosecurity measures, etc.
Questionnaire is a simplified version of official questionnaire for investigation of African swine fever in Lithuania
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