did patient 71558 have any results from the microbiology of the dialysis fluid in this month?
select count(*)>0 from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 71558 ) and microbiologyevents.spec_type_desc = 'dialysis fluid' and datetime(microbiologyevents.charttime,'start of month') = datetime(current_time,'start of month','-0 month')