Spontaneous abortion is the death and resorption or expulsion of a fetus before the pregnancy has come to term. Some people choose to abort unwanted pregnancies intentionally, but abortion can also occur in planned pregnancies. Be aware that it is possible for the dam to abort one or more kittens and still maintain and deliver healthy full term kittens later. Since early pregnancy is difficult to confirm before 16 days post fertilization, abortions early in pregnancy may be diagnosed as infertility.
Abortion after confirmation of pregnancy can occur without any signs of illness. You may not know the dam has aborted until you realize it is past her due date and there are no kittens. Subsequent examination reveals that she is no longer pregnant. In these situations, the kittens were probably aborted early enough to result in reabsorption.
In late stage abortion, you may see:
Abdominal contractions
Vaginal discharge
Expulsion of the premature fetus (live or dead)
Causes of abortion can be divided into maternal causes and fetal causes. Maternal causes include:
Severe illness from preexisting disease
Brucella infection
Herpes infection
Uterine disease
Ovarian disorder leading to low progesterone levels
Fetal causes are primarily related to abnormal development and early fetal death.
Diagnosis
Diagnosing spontaneous abortion can be difficult. Pregnancy in the dam can be confirmed 16 days post fertilization. If the abortion occurs before this, there is no way to determine if the dam aborted or was never pregnant.
After 16 days, ultrasound can confirm the presence of kittens. If future ultrasounds or x-ray examinations reveal fewer kittens or no kittens, abortion is diagnosed.
Determining the cause of the abortion can also be tricky. The best way to find out why your dam aborted and to help prevent future abortions, post mortem (necropsy) examination of the aborted puppy is highly recommended. If the puppy is not available or was absorbed by the mother, specific tests on the dam may help determine the cause.
Prior to breeding, all cats should be tested for Brucellosis. This is a bacterial infection that is easily spread from cat to cat and can infect people. It is difficult to treat and there is no vaccine to prevent transmission. All cats found to be Brucella positive should be excluded from any breeding program.
Brucella infection typically results in abortion at about 45-55 days of pregnancy.
Other tests that can be done on the mother include:
Blood tests to determine overall health
Uterine biopsies can help determine if there is any uterine disease present
Blood progesterone levels can help diagnose an ovarian problem related to sustaining a pregnancy.
Treatment
There is no treatment to stop abortion. Treatment is aimed at helping to reduce abortion in future litters. The treatment, if possible, is specific for the cause of the abortion. If no cause is found, no treatment will be available and future pregnancies may be normal or result in abortion again.
Home Care and Prevention
There is no home care for abortion. Save any aborted kittens for examination by a pathologist to help determine the cause and prevent future abortions.
Without knowing the cause of abortion, there is no preventative care. For certain diseases or conditions, preventative treatment is available for future litters.
