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T-cell-mediated immune responses play a fundamental role in controlling  Mycobacterium tuberculosis  ( M. tuberculosis ) infection, and traditionally, this response is thought to be mediated by Th1-type CD4 +  T-cells secreting IFN-γ. While studying the function and specificity of  M. tuberculosis -reactive CD4 +  T-cells in more detail at the single cell level; however, we found a human CD4 +  T-cell population with a naive phenotype that interestingly was capable of producing multiple cytokines (T CNP  cells). CD4 +  T CNP  cells phenotyped as CD95 lo  CD28 int  CD49d hi  CXCR3 hi  and showed a broad distribution of T cell receptor Vβ segments. They rapidly secreted multiple cytokines in response to different  M. tuberculosis  antigens, their frequency was increased during active disease, but was comparable to latent tuberculosis infection in treated TB patients. These results identify a novel human CD4 +  T-cell subset involved in the human immune response to mycobacteria, which is present in active TB patients’ blood. These results significantly expand our understanding of the immune response in infectious diseases.

Human CD4 T-Cells With a Naive Phenotype Produce Multiple Cytokines During Mycobacterium Tuberculosis Infection and Correlate With Active Disease