General immune system research and study of autoimmune disorders is underway in many locations. Scientists are also conducting research related to autoimmune disorders and the inner ear. Most inner ear research has centered on finding an identifiable inner ear "marker" or chemical that can be tested for so that diagnosis can be faster and more accurate. Other research examines treatments. For example, the American Academy of Otolaryngology-Head and Neck Surgery in conjunction with the National Institutes of Health is studying the treatment of autoimmune inner ear disease.
Remember, nothing is alleged to--or can have--happened to all of MLB over some one or two seasons: the claim is that PEDs were being used at a slowly but steadily increasing rate (and thus "distorting records") from very roughly 1980 through the present. Were that so, or anything like it, we would expect to see a clear long-term uptrend during this period. But we don't: we see a nearly flat line that, if anything, slopes slightly down. The "boost" just isn't there. But that doesn't seem to stop anyone from talking about it.