instruction: have any microbiology test been performed since 07/2101 for patient 91004?
response: SELECT COUNT(*) > 0 FROM microbiologyevents WHERE microbiologyevents.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 91004) AND STRFTIME('%y-%m', microbiologyevents.charttime) >= '2101-07'