CAE, CL and Johne’s Testing in Goats: Read and Keep the Reports

CAE, CL and Johne’s testing in goats involves different tests for different infections. A blood antibody result, a culture from an abscess and a fecal PCR result do not answer the same question. Keep the animal’s identity, collection date, specimen, method and original report together; health and medical records on Creatures give that paperwork a home.

Laboratory and veterinary guidance rechecked November 12, 2026. Use your herd veterinarian and the testing laboratory to choose the plan and interpret an unexpected result. A negative result on one animal on one date is not a guarantee that the animal, its offspring or the whole herd is free of infection.

Start with the question you need the test to answer

Are you monitoring an established dairy herd, assessing incoming stock, investigating a swelling or checking an unexpected previous result? Tell the veterinarian and lab which job you are doing. The Washington Animal Disease Diagnostic Laboratory goat testing page describes its CAE, CL and Johne’s serologic panel and directs keepers to the chosen test’s specimen requirements. A panel name does not make its component results interchangeable.

Write the animals’ permanent identifiers on your submission key and check that the returned report uses the same identities. Ask the laboratory about the appropriate specimen, container, handling and submission form before samples are collected. Do not copy collection quantities or shipping instructions from a different test.

CAE: antibody testing is not a clinical diagnosis

Caprine arthritis encephalitis, or CAE, is associated with a small ruminant lentivirus. WADDL offers a small-ruminant lentivirus cELISA as a standalone test and within its biosecurity screen. It uses blood or serum testing in the herd-control context.

Merck’s CAE guidance explains that a positive antibody test in an adult goat implies infection, but does not establish that any particular clinical sign is caused by CAE. A negative result cannot reliably exclude infection because antibody development and detectable levels vary.

Age matters. WADDL generally advises against routine testing of goats younger than six months and recommends follow-up of younger positive animals because maternal antibodies can influence results. Give the veterinarian the kid’s age and relevant history; do not turn a dam’s result into a result for her kid.

Keep the original method and result wording. “CAE negative” without the animal, laboratory and collection date loses the context the next keeper needs.

CL: distinguish herd screening from an abscess culture

Caseous lymphadenitis, or CL, is caused by Corynebacterium pseudotuberculosis. WADDL’s CL testing guidance separates an SHI antibody blood test from culture of material from an abscess.

The SHI result is most useful as part of herd screening. A positive result can reflect exposure, a past infection or vaccination, and does not by itself diagnose an active abscess in that individual. A negative result does not definitively rule out infection. Record vaccination history and the laboratory’s comments with the result so that context is not lost.

For a visible abscess, the veterinarian can arrange culture to identify the organism. Not every abscess is CL. Merck’s CL guidance supports keeping affected animals apart until culture results are back, even though other bacteria can cause similar lesions. WADDL says to treat every abscess as CL until culture shows otherwise. Keep a goat with a new abscess separate and contact your veterinarian before moving it into another group or sending it to a buyer. Do not open the lesion yourself as a way to settle the question.

Johne’s: antibody screening and organism detection differ

Johne’s disease is associated with Mycobacterium avium subspecies paratuberculosis, usually shortened to MAP. WADDL’s testing strategy recommends PCR for direct detection of MAP and identifies feces or intestine as relevant specimens. For a live-goat testing discussion, ask the lab and veterinarian about the appropriate fecal submission; tissue sampling is a diagnostic veterinary job.

A Johne’s ELISA blood test looks for an antibody response. It is not the same test as a PCR looking for the organism’s genetic material. Ask which result addresses the present question, what a negative result can miss and what follow-up is appropriate. The report and clinical history need to be interpreted together.

Method changes also matter when comparing old reports. WADDL announced a small-ruminant Johne’s ELISA kit change effective June 1, 2025, after reviewing disagreement between kits. It returned to the kit used before October 2023. The kit it replaced had been in use since October 2023 and, in WADDL’s comparison, tended to return more positives in goats. Note which kit period an older WADDL report falls in. Preserve the lab, method, date, original values and comments. Do not diagnose a change in the goat’s infection status simply because differently performed tests disagree.

When herds test

WADDL’s CAE guidance gives a starting schedule: test twice a year at first, then once a year in herds that are mostly negative, with a test before breeding. It says new goats should be quarantined and tested twice, at least 60 days apart, before they join negative animals.

For CL, WADDL’s serology guidance prefers testing ten or more animals in the herd the goat comes from. Where that is not possible, it advises quarantine and two tests 30 days apart. It sets no fixed interval for an established herd and bases timing on earlier results, the control plan and exposure risk. Its Johne’s strategy page gives no calendar. Agree your own schedule with your veterinarian and keep each disease’s plan distinct.

A sick goat or an active swelling needs veterinary assessment, even if an earlier screening report was negative; waiting for the next routine date does not answer a new clinical question.

Read a report before sharing it with a buyer

Check these details together:

1. Animal identity: does the laboratory ID map to this goat’s tattoo, tag or other permanent identifier?
2. Collection date: distinguish when the sample was taken from when the laboratory released the result.
3. Specimen and method: blood/serum antibody screening, fecal PCR or lesion culture, as reported.
4. Result wording: retain positive, negative, suspect, indeterminate or other wording exactly as the lab uses it. Keep the reference information and comments with it.
5. Scope: name the goats that were actually tested. A sample of the herd or a dam’s report is not testing of every kid.
6. Follow-up: keep the veterinarian’s interpretation, any additional test and the next agreed action with the original report.

That produces a useful factual statement: this identified animal had this reported test on this collection date. It does not turn a report into a promise about every infection or future exposure.

If you are assessing incoming stock, use the goat buying guide to prepare the records questions before a pickup is arranged. Ask for the actual reports and their scope rather than relying on appearance or a general herd label.

Keep the report on the goat’s Creatures profile

Open the existing animal in your herd, or create a goat profile if it does not have one. Then add a Test Result record: it has separate fields for the date of sampling, the date of the report and the result as worded by the lab. Attach the laboratory report so the original stays with the record, and put the method and specimen in the notes. Expand the extra fields to enter the sampling date. Preserve the exact result wording instead of reducing a suspect or indeterminate result to a yes/no label.

The goat species guide brings together related care and herd management guides.

If a lab key uses a short number, keep its link to the goat’s permanent ID. Our goat tattoo guide and goat record keeping guide help keep those identifiers and source records consistent. A free account saves the record; see adding a record.

When selling goat kids, share the appropriate report and its comments with the buyer, and be precise about which animal it covers. Check the chosen sharing setting and document content before making it public. Creatures stores your record and document; this workflow does not submit a test, sync a laboratory account or certify a herd as disease-free.

Questions keepers ask

Does a negative panel mean the herd is clean? No. Read each method and its limits with the veterinarian and lab, including which animals were sampled and when.

Is a positive antibody result proof of clinical disease? The meaning depends on the disease and test. CAE adult serology supports infection but does not assign the cause of every clinical sign. CL SHI has different individual-animal limitations. Keep the lab interpretation intact.

Should an unexpected result be deleted after a repeat test? Keep both original reports and the follow-up interpretation. That preserves what the veterinarian and laboratory were comparing.

Do this next on Creatures

• Add or identify the goat’s profile before attaching a report. See adding an animal.
• Add the Test Result record. The form opens for visitors; a free account saves it. Read health and medical records.
• Create the farm profile if your herd records belong with a business or team. See getting listed in the breeder directory for the public profile steps.
• Save a goat listing alert if you are also looking for stock; assess each animal’s records separately.
• Browse current goat listings when you are ready to look.
• Browse the breeder directory to find farms to contact about their animals and records.