👉 Lymphopenia is a condition characterized by a low number of lymphocytes, which are white blood cells that play a crucial role in the immune system. The body's immune system fights off infections and diseases by identifying and destroying foreign substances such as viruses, bacteria, and parasites. In the context of lymphopenia, this means that there are fewer than 500 million to 1 billion white blood cells called lymphocytes in one's blood. This number is a measure of how many
