is there any results from a microbiology test in patient 31482's blood culture in 12/2105?
select count(*)>0 from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 31482 ) and microbiologyevents.spec_type_desc = 'blood culture' and strftime('%y-%m',microbiologyevents.charttime) = '2105-12'