Memory CD4+ T-cell-mediated protection depends on secondary effectors that are distinct from and superior to primary effectors.

Abstract excerpt

Whether differences between naive cell-derived primary (1°) and memory cell-derived secondary (2°) CD4(+) T-cell effectors contribute to protective recall responses is unclear. Here, we compare these effectors directly after influenza A virus infection. Both develop with similar kinetics, but 2° effectors accumulate in greater number in the infected lung and are the critical component of memory CD4(+)...

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