“…Since then, about 160 SIgMD cases have been reported, occasionally in association to other immune Metastatic Infection by Methicillin-Sensitive Staphylococcus aureus and its Potential Association to an Unusual Humoral Immunodeficiency diseases [3,8,9]. Prevalence is estimated around 0.03-0.37% in general population, 0.07-0.26% in Immunology-&-Allergy Clinics, 0.1-3.8% in hospitalized patients, and up to 6% within primary-immunodeficiency patients [2][3][4][5]10]. Apparently, there is no difference in SIgMD sex-distribution [2], however it tends to be more frequently symptomatic in men, finding a male-to-female ratio of even 11:2 [3,5,9,11,12].…”