As the virus attacks the nervous system, infected dogs develop circling behavior, head tilt, muscle twitches, convulsions with jaw chewing movements and salivation (âchewing gum fitsâ), seizures, and partial or complete paralysis. In wildlife, infection with canine distemper closely resembles rabies.
Most cases of female infertility are caused by problems with ovulation. Without ovulation, there are no eggs to be fertilized. Some signs that a woman is not ovulating normally include irregular or absent menstrual periods. Ovulation problems are often caused by polycystic ovarian syndrome (PCOS). PCOS is a hormone imbalance problem which can interfere with normal ovulation. PCOS is the most common cause of female infertility. Primary ovarian insufficiency (POI) is another cause of ovulation problems. POI occurs when a woman's ovaries stop working normally before she is 40.
Most couples who have unprotected sex at least twice per week are able to become pregnant within one year. If pregnancy does not occur after one year, the man and woman are diagnosed as having an infertility problem. Infertility can result from problems in the man, the woman or both partners. In some couples, no cause of infertility can be found. In other couples, more than one cause exists.