Wijngaard, C.C. van den

surveillance disease syndromic syndromic surveillance syndrome cluster outbreak pathogen q fever pneumonia signal hospitalization infection detection virus cause model health influenza laboratory netherland fluenza mortality fever chapter system count table study registry patient hospital diagnose activity pathogen counts dutch analysis result variation regression pneumoniae appendix level syndromic data figure submission hepatitis encephalitis elevation population number practice pathogen activity symptom statistic q-fever illness analyses research incidence cluster signals period meningiti information disease surveillance disease dynamics pharmacy interval outbreak detection value absenteeism proportion coverage control emerg epidemic wijngaard report recurrence syncytial virus