what specimen test was given to patient 97330 for the last time since 09/2103?
select microbiologyevents.spec_type_desc from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 97330 ) and strftime('%y-%m',microbiologyevents.charttime) >= '2103-09' order by microbiologyevents.charttime desc limit 1