Table 1.
Seroprevalence and seropositivity increases (≥4-fold) of GIII.2 BoNoV and nebovirus in 6- to 7-month-old feedlot calves from New Mexico (NM), Arkansas (AR) and Ohio (OH) and 7- to 10-day-old veal calves from OH pre- and post-arrival on farms
| Region (years) | GIII.2 BoNoV | Nebovirus | |||||
|---|---|---|---|---|---|---|---|
| 3-22 days pre-arrival | 35 days post-arrival (or post-commingling) | 3-22 days pre-arrival | 35 days post-arrival (or post-commingling) | ||||
| Seroprevalence rate | Seropositive increase ratea | Seroprevalence rate | Seroprevalence rate | Seropositive increase ratea | Seroprevalence rate | ||
| 6-7-month-old feedlot calves | MN (2001) | 97 % (100/103) | 75 % (77/103) | 100 % (103/103) | 78 % (80/103) | 65 % (67/103) | 90 % (93/103) |
| AR (2001) | 94 % (94/100) | 85 % (85/100) | 99 % (99/100) | 100 % (100/100) | 83 % (83/100) | 100 % (100/100) | |
| OH (1999-2000) | 94 % (132/140) | 38 % (32/84)b | 100 % (84/84)b | 99 % (83/84)c | 32 % (27/84) | 97 % (81/84) | |
| Total | 95 % (326/343) | 68 % (194/287) | 100 % (286/287) | 92 % (263/287) | 62 % (177/287) | 95 % (274/287) | |
| 7-10-day-old veal calves | OH (1999) | 94 % (44/47) | 49 % (23/47) | 100 % (47/47) | 40 % (19/47) | 26 % (12/47) | 66 % (31/47) |
aSeropositive increase rate was defined as a fourfold increase in antibody titer
bFor the 1999 OH feedlot group, samples (n=56) were collected only at arrival, but not at 35 days post-arrival
cOnly the 2000 OH feedlot-group samples (n=84) were tested for nebovirus antibody