Inherited maternal memory T cells protect offspring from respiratory viral infection through disease tolerance
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H. Toure, B. Jimena, M. E. Caban, E. E. Lederer, D. M. Rico, A. Medlin McFadden et al. · DOI: 10.64898/2026.10.30.763208 · Summary page
Why cover this story this week?
A maternal legacy that limits damage rather than infection
Maternal antibodies are a familiar source of early-life protection, but a new preprint identifies another: memory T cells passed from mother to offspring. Through experiments testing their removal and transfer, researchers found these cells necessary and sufficient to protect offspring against lethal respiratory infection. Protection depended on the maternal cells producing IL-10, an immune-regulating signal, rather than on maternal antibodies or the offspring’s own T-cell responses.
The striking distinction is that protected offspring did not carry less virus. Instead, they had less inflammation and lung damage: the transferred cells helped them tolerate infection rather than eliminate it. Maternal vaccination also produced protection that depended on T cells. The findings suggest a complementary goal for maternal vaccines—passing on mechanisms that restrain damaging immune responses—but do not yet establish a vaccination strategy for people.
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