Table 2.
Timeline for calf diarrhea agents
| Agent | Typical Age at Infection | Small Ruminants |
|---|---|---|
| E coli (ETEC, K99) | 0–7 d | — |
| E coli (EHEC) | 2 d–4 wk | — |
| Rotavirus | 5–14 d | Up to 16 wk; may differ depending on serogroup |
| Coronavirus | 5 d–1 mo | — |
| Cryptosporidium | 1–4 wk | 1–4 wk |
| Clostridium perfringens | Varies with type | Varies with type |
| Salmonella | 5–14 d, anytime | 1–7 d, anytime |
| Giardia | 2 wk–2 mo | — |
| BVDV | First month of life, anytime | — |
| Nematodiasis | After 3 wk of life | After 3 wk |
| Coccidia (Eimeria) | After 1 mo of life, weaning | 2 wk–5 mo, weaning |
Abbreviations: BVDV, bovine viral diarrhea virus; EHEC, enterohemorrhagic E coli; ETEC, enterotoxigenic E coli.