Table 4.
Serum GGT activities of horses in contact with clinical cases of Theiler's disease
| GGT (hepatitis) | ||||||
|---|---|---|---|---|---|---|
| Increased | n = 10 | Within reference interval | n = 22 | All | ||
| EqPV‐H | Detected n = 20 | 48 U/L (20‐98) | n = 7 | 13 U/L (10‐16) | n = 13 | 16 U/L (10‐98) |
| Not detected n = 12 | 29 U/L (26‐32)a | n = 3 | 15 U/L (9‐21) | n = 9 | 16 U/L (9‐32) | |
| All | 39.5 U/L (20‐98) | 14 U/L (9‐21) | ||||
Hepatitis was defined as serum GGT above reference interval within 2 weeks of serum PCR testing for EqPV‐H. An additional 5 horses were reported to have normal serum GGT at the time of PCR testing, and 3 of 5 horses were EqPV‐H PCR+, but specific GGT values were not available. GGT is expressed as median (range) in U/L.
Abbreviations: EqPV‐H, equine parvovirus‐hepatitis; GGT, gamma‐glutamyltransferase.
a
All horses in this group were tested at a laboratory with an upper limit of reference interval for GGT of 19 U/L, whereas the upper limit at other laboratories ranged from 30 to 35 U/L.