instruction: what was the name of that first specimen test patient 83466 got since 05/2101?
response: SELECT microbiologyevents.spec_type_desc FROM microbiologyevents WHERE microbiologyevents.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 83466) AND STRFTIME('%y-%m', microbiologyevents.charttime) >= '2101-05' ORDER BY microbiologyevents.charttime LIMIT 1