what was the name of that first specimen test patient 83466 got since 05/2101?
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 asc limit 1