what was the specimen test that patient 58028 last received until 02/2104?
select microbiologyevents.spec_type_desc from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 58028 ) and strftime('%y-%m',microbiologyevents.charttime) <= '2104-02' order by microbiologyevents.charttime desc limit 1