when did patient 61339's last blood culture ( myco/f lytic bottle) microbiology test until 02/2101 be performed?
select microbiologyevents.charttime from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 61339 ) and microbiologyevents.spec_type_desc = 'blood culture ( myco/f lytic bottle)' and strftime('%y-%m',microbiologyevents.charttime) <= '2101-02' order by microbiologyevents.charttime desc limit 1