what was the name of the organism found in the first urine microbiology test of patient 97834 until 04/2103.
select microbiologyevents.org_name from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 97834 ) and microbiologyevents.spec_type_desc = 'urine' and microbiologyevents.org_name is not null and strftime('%y-%m',microbiologyevents.charttime) <= '2103-04' order by microbiologyevents.charttime asc limit 1