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Table 2 Serum titers of IgG against A. phagocytophilum in a dairy cattle herd (heifers and cows) from May 2011 to January 2012

From: Epidemiology, genetic variants and clinical course of natural infections with Anaplasma phagocytophilum in a dairy cattle herd

Month

Total no. of cowsa

Titers

  

0

1:50

1:100

1:200

1:400

1:800

1:1600

1:3200

1:6400

May

50 (39, 11)

48 (37, 11)

2 (2, 0)

0

0

0

0

0

0

0

July

58 (39, 19)

29 (20, 9)

8 (7, 1)

7 (5, 1)

8 (3, 5)

1 (0, 1)

0

2 (1, 1)

2 (2, 0)

1 (1, 0)

September

55 (36, 19)

30 (19, 11)

10 (7, 3)

11 (7, 4)

3 (3, 0)

1 (0, 1)

0

0

0

0

November

56 (37, 19)

33 (21, 12)

13 (8, 5)

7 (3, 4)

0

0

3 (2, 1)

0

0

0

January

52 (34, 18)

40 (25, 15)

10 (9, 1)

1 (0, 1)

1 (0, 1)

0

0

0

0

0

  1. aNumbers of cows and heifers, in that order, are indicated in parentheses