CD9 and early-onset autosomal dominant Alzheimer disease: The focus of this study is on the antimicrobial inhibitory effect of CD9 tetraspanin peptides against the axillary microbiota as an alternative to antiperspirants whose ingredients contain aluminium, which is known to cause anaphylaxis, Alzheimer’s disease, and Parkinson’s disease, especially in immunocompromised individuals [17,18].