an epidemiological study of listeriosis in dairy cattle

2. 2. Materials and Methods 47
2. 2. 1. Study Population 47
2. 2. 2. Study Design 47
2. 2. 3. The Questionnaire 47
2. 2. 4. Data Analysis 48
2. 2. 5. Data processing and analysis 50
2. 3. Results 50
2. 3. 1. Response rate 50
2. 3. 2. The prevalence of listeriosis at farm level 50
2. 3. 3. The incidence of listeriosis at herd level 52
2. 3. 4. Season 53
2. 3. 5. The prevalence of listeriosis in other animals
55
2. 3. 6. Clinical signs associated with reported cases of listeriosis 55
2. 3. 7 Treatment 57
2. 3. 8. Validation of the questionnaire 58
2. 3. 9. Herd size 60
2. 4. Discussion 60
CHAPTER 3
The relationship between farm management practices and clinical
listeriosis in dairy cattle in England: univariate analysis 65-106
3. 1. Introduction 65
3. 2. Materials and Methods 66
3. 2. 1. Study design 66
ix