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Disease in a Dairy Herd

 

Read this introduction, examine the table, and answer the questions on the following pages.

Suppose you are an extension veterinarian called for consultation by a local practitioner. A disease characterized by high fever, pulmonary and pleural effusion, anuria, and rapid death occurred on R. and L. Dairy Farm beginning June 2, 1967. This farm consists almost entirely of cleared improved pasture and abuts on a state forest.
The animals are all purebred Jerseys or Brown Swiss. Cows being milked are housed in Barn A. Dry cows also are kept in one section of Barn A but a few days before calving are transferred to Barn B, located on another part of the farm. One day after calving, the fresh cows are moved back to Barn A and the calves kept in pens in Barn B for about one month. Older calves are kept in Barn C at some distance from both of these buildings. Animals from Barns A and C are pastured separately. Other data on the herd and this disease episode are given in Table.
You learn that two other herds in the county were also affected. This county includes a portion of a forested state park. To your knowledge, no other cases of a similar disease have occurred recently in the state or elsewhere. However, you and local veterinarians note the similarity between this disease on these three farms and several other occurrences of disease in this same county in the summer of 1959. At that time several R. and L. calves (N4378, N4380, and N4382) were sick but they recovered. No agent was isolated from the 1959 outbreaks and the condition was undiagnosed.
Insofar as is known, this disease has never been seen anywhere apart from these two occurrences in cattle in your county. The springs and summers of both 1959 and 1967 were unusually dry.

*Adapted from Epidemiology in Veterinary Practice. Schwabe CW, Riemann HP, Franti CE. Lea & Febiger 1977. Modified December 2, 1990.

Raw data   Questions   Solutions

COW #
WARD
BREED
AGE
DATE ADDED
DATE OF ONSET
DATE DIED
STATUS
A15674
BARN A
JERSEY
3
5/30/67
6/2/67
6/6/67
D
R325
BARN A
JERSEY
4
10/2/65
6/14/67
6/18/67
D
D1754
BARN A
JERSEY
8
12/4/63
6/14/67
6/19/67
D
R758
BARN A
JERSEY
5
1/18/64
6/14/67
6/18/67
D
C175
BARN A
JERSEY
4
4/4/67
6/15/67
6/18/67
D
Z1926
BARN A
JERSEY
5
5/30/67
6/16/67
6/19/67
D
B328
BARN A
JERSEY
7
4/4/60
6/16/67
6/19/67
D
12C35
BARN A
SWISS
3
11/22/66
6/22/67
RECOVER
R
R478
BARN A
JERSEY
3
1/3/67
6/22/67
6/26/67
D
?
BARN A
JERSEY
9
8/22/60
6/22/67
RECOVER
R
M1572
BARN A
JERSEY
8
8/22/60
6/23/67
6/26/67
D
B1320
BARN A
SWISS
9
9/15/60
6/23/67
6/27/67
D
A3257
BARN A
JERSEY
4
11/4/66
6/23/67
RECOVER
R
D591
BARN A
JERSEY
3
4/4/67
6/23/67
RECOVER
R
10C59
BARN A
SWISS
3
1/18/65
NOT AFF
NA
B7624
BARN A
SWISS
3
1/18/65
NOT AFF
NA
N4378
BARN A
JERSEY
8
8/12/65
NOT AFF
NA
8D142
BARN A
SWISS
7
8/22/60
NOT AFF
NA
?
BARN A
SWISS
5
8/12/65
NOT AFF
NA
N4382
BARN A
JERSEY
8
8/12/59
NOT AFF
NA
7F82
BARN A
SWISS
5
12/4/63
NOT AFF
NA
42C891
BARN A
SWISS
9
3/15/62
NOT AFF
NA
C358
BARN A
JERSEY
5
8/6/67
8/24/67
8/28/67
D
C359
BARN A
JERSEY
4
8/6/67
8/26/67
8/29/67
D
Z1581
BARN B
JERSEY
6
7/30/67
8/15/67
8/19/67
D
C-Z1581
BARN B
JERSEY
1
8/2/67
8/15/67
RECOVER
R
C-B1320
BARN B
SWISS
1
8/3/67
NOT AFF
NA
C-N4382
BARN B
JERSEY
1
7/6/67
8/26/67
RECOVER
R

Pattern by Housing

Barn No. Infection No. Dead No. Recovered Total Population
Barn A
16
12
2
24
Barn B
3
1
2
4
Barn C
0
0
0
0
Total
19
13
4
28

housing_data

Summary Data by Breed 

By Breed No. Infected No. Dead No. Recovered Total Pop
Brown Swiss
2
1
1
9
Jersey
17
12
3
19
Total
19
13
4
8

  breed

      Weekly Time Pattern

Week
Total
No. Infected
No. Dead
No. Recovered
1
3
2
0
2
3
6
4
2
1
4
4
4
3
0
5
5
3
3
0
6
1
1
1
0
7
2
1
1
0
8
4
2
2
0
9
3
2
1
1
Total
28
19
13
4
 

  weekly_summery

    Daily Time Pattern

Date
Total No. Infected
Total No. Dead
Total Pop.
Date
Total No. Infected
Total No. Dead
Total Pop.
1-Jun
0
0
22
16-Jun
6
0
21
2-Jun
1
0
22
17-Jun
6
0
21
3-Jun
1
0
22
18-Jun
6
3
21
4-Jun
1
0
22
19-Jun
3
3
18
5-Jun
1
0
22
20-Jun
0
0
15
6-Jun
1
1
22
21-Jun
0
0
15
7-Jun
0
0
21
22-Jun
3
0
15
8-Jun
0
0
21
23-Jun
7
0
15
9-Jun
0
0
21
24-Jun
7
0
15
10-Jun
0
0
21
25-Jun
7
0
15
11-Jun
0
0
21
26-Jun
5
2
15
12-Jun
0
0
21
27-Jun
4
1
13
13-Jun
0
0
21
28-Jun
4
0
12
14-Jun
3
0
21
29-Jun
4
0
12
15-Jun
4
0
21

   june_data

 

 

 

 

 

 

 

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