instruction: when did until 58 months ago patient 17505 last get a catheter tip-iv microbiology test?
response: 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