I am wondering if anyone's immunilogiest have run tests against pneumococal vaccine titers due to multiple upper and lower respiratory infections. Mines were low, we did conjugate vaccine, re-checked in 6 weeks and títers still below 50%. There arent much research with in regards to SAD - specific antibody deficiency, but most articles i came across talk about people with asthma and SAD. All the ear infections, sinus infections, PNAs can be the answer or reasons why we get them. I didn't find anything in archives.