until 10/2104 when did patient 8005 last get a microbiology test?
select microbiologyevents.charttime from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 8005 ) and strftime('%y-%m',microbiologyevents.charttime) <= '2104-10' order by microbiologyevents.charttime desc limit 1