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A long-standing question is whether T cell receptor (TCR) signal strength can dominantly instruct the development of Th1 and T follicular helper (Tfh) cells across distinct infectious contexts. We characterized the differentiation of murine CD4 TCR transgenic T cells responding to altered peptide ligand lymphocytic choriomeningitis viruses (LCMV) derived from acute and chronic parental strains. We found that TCR signal strength exerts opposite and hierarchical effects on the balance of Th1 and Tfh cells responding to acute versus persistent infection. TCR signal strength correlates positively with Th1 generation during acute but negatively during chronic infection. Weakly activated T cells express lower levels of markers associated with chronic T cell stimulation and may resist functional inactivation. We anticipate that the panel of recombinant viruses described herein will be valuable for investigating a wide range of CD4 T cell responses.<\/jats:p>","DOI":"10.7554\/elife.61869","type":"journal-article","created":{"date-parts":[[2021,3,5]],"date-time":"2021-03-05T09:00:52Z","timestamp":1614934852000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.61869","source":"Crossref","is-referenced-by-count":38,"title":["Opposing effects of T cell receptor signal strength on CD4 T cells responding to acute versus chronic viral infection"],"prefix":"10.7554","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7699-779X","authenticated-orcid":true,"given":"Marco","family":"K\u00fcnzli","sequence":"first","affiliation":[{"name":"Immune Cell Biology Laboratory, Department of Biomedicine, University of Basel, University Hospital Basel, Basel, 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