What is the strain Acidophilus Bifidum, and how do I correct this?

Acidophilus is known as a friendly strain of bacteria and is believed to help regulate the digestive system. improve the symptoms of irritable bowel syndrome (IBS) boost the immune system. An imbalance in this strain may be contributing to different symptoms associated with these areas of the body. 

Yogurt and kefir – a fermented milk drink – that contain “live active cultures” can help replenish this strain. Miso, tempeh, soy milk, and buttermilk are other good sources of dietary acidophilus, on the basis, these foods are well tolerated. 
You can also find acidophilus in tablet, capsule, suppository, and powder form, generally in the supermarket's refrigerated section.