Clinical observations and management of a severe equine herpesvirus type 1 outbreak with abortion and encephalomyelitis

Table 1 Description of horse populations in the different barns on the stud

Barn	No. of horses	Affected horses	Horse description^a	Same staff as horses of other barns
1	6	5	SH; VH	yes
2	8	6	SH; VH	yes
3	12	8	SH; VH	yes
4	20	14	SH; VH	yes
5	12	10	SH; VH	yes
6	10	8	SH; VH	yes
7	11	10	BM; 1 foal	yes
8	10	0	BS	no
9-11	90	1 (?)^b	AH	no

^aSH = Sport Horses; VH = Visiting Horses; BM = Brood Mares; BS = Breeding Stallions; AH = Adolescent Horses.
^bClinical EHM signs, but no laboratory data available.
The index case was an abortion in barn 7. With the exception of the stallion barn and one questionable EHM case in the adolescent group (barns 9–11), all barns were affected. All affected barns were situated ≤ 50 meters next each other. The adolescent horses were stabled in barns 9–11, situated 500 to 1000 meters from the other barns. Horses from barns 1 – 7 used the same training facilities and paddocks.

ISSN: 1751-0147