In a mouse model for Alzheimer’s disease [111], early life exposure to antibiotics for one week led to persistent changes in microbiota composition with increased Lachnospiraceae and decreased S24–7 later in life and decreases in IL-2, IL-3, and stem cell factor (SCF) in the cerebrospinal fluid. This evidence concerns the gene KITLG and early-onset autosomal dominant Alzheimer disease.