Volume 22, Number 10—October 2016
Daily Reportable Disease Spatiotemporal Cluster Detection, New York City, New York, USA, 2014–2015
|Disease||Annual no. cases‡||No. signals during 365 d of prospective surveillance†
|Recurrence interval >365 d§||Recurrence interval >100 d||Recurrence interval >30 d|
|Hemolytic uremic syndrome||4||0||0||0|
|Acute hepatitis B||51||0.6||1.2||3.7|
|Human granulocytic anaplasmosis||51||0.6||0.6||0.6|
|Human monocytic ehrlichiosis||8||0||0.6||0.6|
|Invasive group A Streptococcus disease||263||0||0||1.8|
|Invasive group B Streptococcus disease||33||0.6||1.2||2.4|
|Invasive Haemophilus influenzae disease||97||0||0||1.8|
|Invasive Streptococcus pneumoniae disease||647||0||1.2||1.8|
|Noncholera Vibrio spp. infection||18||0||0||0|
|Rocky Mountain spotted fever||6||0||0||2.4|
|Shiga toxin–producing Escherichia coli||96||0||0||0|
|Vancomycin-intermediate Staphylococcus aureus infection||28||0||0||0|
|West Nile virus disease||19||0||0||0|
|Total signals across all diseases under surveillance||NA||17.8||27.6||69.8|
*Signals were detected by using the prospective space–time permutation scan statistic. NA, not applicable.
†A signal for a particular disease was defined as unique if the first most likely cluster on a particular day did not encompass any of the same census tracts as the first most likely cluster on the prior day. The signaling rate for most diseases was based on 598 d of surveillance (February 10, 2014–September 30, 2015). For 5 diseases, the signaling rate was based on a shorter surveillance period to reflect analytic adjustments: hepatitis A, paratyphoid fever, and typhoid fever (190 d under surveillance after extending to a 60-d maximum temporal cluster size); legionellosis (160 d under surveillance after excluding unresolved cases); and Shiga toxin–producing E. coli (21 d under surveillance after excluding cases with only a positive multiplex PCR gastrointestinal panel test).
‡Confirmed, probable, and suspected cases among residents with event dates October 1, 2014–September 30, 2015.
§The signal was detected at the lower ≥100-d threshold on the same day for 50% of the signals, 1 d earlier for 19% of signals, 2 d earlier for 19% of signals, 3 d earlier for 6% of signals, and 7 d earlier for 6% of signals.