Chlamydiosis in Goats: Enzootic Abortion, Placenta Changes, and Prevention

Chlamydiosis in goats usually refers to reproductive infection caused by Chlamydia abortus, the organism linked with enzootic abortion. In goats, it is a major cause of abortion outbreaks, especially in herds that have not been exposed before. In naïve herds, a large percentage of pregnant does may abort, deliver stillborn kids, or have weak newborns.

Most affected does look normal until late pregnancy, then suddenly abort. Reproductive failure is often the main sign, although some herds may also see retained placentas and, less commonly, conjunctivitis, respiratory signs, or joint inflammation. The placenta often shows the most useful visible changes, while aborted kids may look fresh and have few obvious external lesions.

This condition matters beyond the individual doe. It can spread through contaminated placentas, fluids, bedding, and the kidding environment. It is also zoonotic, which means people can become infected. Pregnant people are at particular risk and should avoid contact with aborting goats, placentas, and contaminated areas.

Chlamydiosis in goats is caused mainly by Chlamydia abortus. The organism is shed in very high numbers in placentas, fetal fluids, and vaginal discharge around abortion or kidding. Goats are usually exposed by inhaling or ingesting contaminated material in bedding, feed areas, pens, or on shared equipment.

New additions to the herd can introduce infection, especially if they were exposed before purchase and are carrying the organism without obvious signs. Crowded kidding areas, poor sanitation, and delayed cleanup after an abortion all increase spread. Once the organism is in the environment, other pregnant does can be exposed quickly.

The placenta is a major target. In chlamydial abortion, the most typical lesion is placentitis, with reddish-brown exudate covering cotyledons and intercotyledonary areas. Under the microscope, vets may see necrotizing vasculitis and neutrophilic inflammation in the placenta. Because other infectious causes of abortion can look similar, your vet usually needs lab testing to confirm the cause rather than relying on appearance alone.

Diagnosis starts with herd history and sample quality. Your vet will ask when abortions occurred, how many does are affected, whether the losses are clustered in late gestation, and whether any new goats were recently introduced. The placenta is the most useful sample, so if you can safely collect it, that can improve the odds of a clear answer.

Definitive diagnosis usually relies on laboratory testing. Common options include PCR, fluorescent antibody testing, immunohistochemistry, ELISA, culture, or a full abortion workup through a veterinary diagnostic lab. Placenta is the specimen of choice, but fetal liver, lung, and spleen may also help. Because chlamydial organisms seen on stained placental smears can resemble Coxiella burnetii, your vet may recommend broader testing to sort out the true cause.

In practical terms, a conservative workup may be a farm exam plus basic sample submission, while a more complete workup may include a necropsy-style small ruminant abortion panel. Recent US lab examples show PCR fees around $55 and small-ruminant abortion panel fees around $200 before clinic markup, shipping, and farm-call charges, so total client-facing cost ranges can vary quite a bit.

Prevention focuses on herd biosecurity and fast response to any abortion event. Isolate aborting does immediately, remove placentas and contaminated bedding right away, and clean and disinfect kidding areas as your vet recommends. Separate pregnant does from animals that have aborted or recently kidded until your vet says the risk is lower.

Quarantine new arrivals before mixing them into the breeding herd. Ask about reproductive history, prior abortion problems, and source-herd health practices. Good kidding hygiene, lower stocking density, and limiting traffic between pens can all reduce spread during high-risk periods.

Work with your vet on a herd plan before breeding season. In the US, there is no goat-specific chlamydial vaccine commercially available according to Merck Veterinary Manual, although sheep vaccine use may be discussed in some herd situations. That makes management, sanitation, and careful herd introductions especially important.

Because this disease is zoonotic, prevention also means protecting people. Pregnant people should not handle aborting does, placentas, or contaminated bedding. Gloves, dedicated clothing, handwashing, and careful disposal of birth materials are practical steps that protect both the herd and the humans caring for it.