A lymphocyte percentage of more than 50 is sometimes a more normal result, but sometimes it is necessary to consider the possibility of a viral infection, which also needs to be seen in conjunction with other results of routine blood tests. In the case of a viral infection, the white blood cell count will be normal or decreasing, with an increase in lymphocytes predominating. In the case of bacterial infections, the white blood cell count may be significantly higher, with a predominance of neutrophils. This is not absolute, as patients with severe bacterial infections may also experience a drop in white blood cells. In viral infections, in addition to a significant increase in lymphocyte count, there is also a significant increase in white blood cell count, such as in epidemic hemorrhagic fever and infectious mononucleosis. So for determining whether it is a bacterial infection or a viral infection or some other cause, it needs to be combined with the whole blood count results to make a comprehensive judgment.