when did until 58 months ago patient 17505 last get a catheter tip-iv microbiology test?
select microbiologyevents.charttime from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 17505 ) and microbiologyevents.spec_type_desc = 'catheter tip-iv' and datetime(microbiologyevents.charttime) <= datetime(current_time,'-58 month') order by microbiologyevents.charttime desc limit 1