in the first hospital visit, has there been any organism found in patient 16271's last joint fluid microbiology test?
select count(*)>0 from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 16271 and admissions.dischtime is not null order by admissions.admittime asc limit 1 ) and microbiologyevents.spec_type_desc = 'joint fluid' and microbiologyevents.org_name is not null order by microbiologyevents.charttime desc limit 1