IL6 and Stroke: In addition, previous studies have found a correlation between interleukin-6 and stroke prognosis.[49] And, the ratio of neutrophils to lymphocytes (NLR) is also related to stroke prognosis.[50–53] Moreover, NLR can reflect the body's immune level when a stress reaction occurs.[54,55] When a stroke occurs, the body will be in an immunosuppressed state, making it more susceptible to infection.