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2016/17 Influenza Season data

  Did you know it is estimated that an average of 200K people are hospitalized due to flu-related complications?

 
 

The Pennsylvania Department of Health (PADOH) monitors influenza activity throughout the year but ramps up surveillance activities in the fall and winter. The official influenza surveillance season starts with the 40th week of the year (typically around the beginning of October) and ends on the 20th week of the following year (in May). For the 2016-2017 season, the influenza surveillance season began on Oct. 2, 2016, and will run through May 20, 2017. Updated influenza activity data will be posted on this web page every Tuesday throughout the influenza surveillance season. These updates will provide a summary on:

1. When and where influenza activity is occurring;
2. Current trends in influenza as compared to previous seasons; and
3. What types and subtypes of influenza viruses are currently circulating. 

It is important to note that the influenza case counts presented on this page are restricted to only those cases that have had a positive laboratory test for flu (by rapid test, DFA, PCR or culture) reported to the PADOH. These case counts represent only a fraction of the actual burden of illness due to influenza occurring in the commonwealth at any given time. This is because most persons with influenza do not go to the doctor or are not tested or reported. Influenza spread and severity varies widely from season to season. It is estimated that five to 20 percent (600,000 to 2,400,000) of Pennsylvanians get the flu each year, and 120 to 2,000 die from complications of influenza.

 
Flu Activity Code: WIDESPREAD (week 11 ending March 18, 2017)

*The flu activity code is a characterization of the geographic spread of influenza in Pennsylvania. It does not indicate how severe the influenza season is. Rather, it indicates how much of Pennsylvania is experiencing influenza activity. The level of activity is classified based on CDC definitions below, which are used by all 50 states to characterize influenza activity.

 
​No Activity No laboratory-confirmed cases of influenza and no reported increase in the number of cases of ILI.

SPORADIC

Small numbers of laboratory-confirmed influenza cases or a single laboratory-confirmed influenza outbreak has been reported, but there is no increase in cases of ILI
  LOCAL
​Outbreaks of influenza or increases in ILI cases and recent laboratory-confirmed influenza in a single region of the state
REGIONAL
​Outbreaks of influenza or increases in ILI and recent laboratory confirmed influenza in at least two but less than half the regions of the state, with recent laboratory evidence of influenza in those regions
WIDESPREAD

Outbreaks of influenza or increases in ILI cases and recent laboratory-confirmed influenza in at least half the regions of the state, with recent laboratory evidence of influenza in the state

 Influenza surveillance data presented below reflect influenza activity during the time period referred to above. Data may change from week to week as numbers are adjusted for late reporting, misclassification of cases, and errors in classifying county or state of residence.

 
PENNSYLVANIA WEEKLY INFLUENZA REPORT
 
Summary:
- Laboratory, hospital emergency department, and sentinel medical provider data all indicate that the flu activity has peaked, but still high for MMWR week 11.
- Highest activity for week 11 has been reported in southeast region.
- Pennsylvania’s current influenza activity code is "WIDESPREAD."
- The first influenza associated death was reported during week 44. 12 flu associated death have been reported during week 11 and total influenza associated death reports season to date is 113, including three pediatric influenza associated deaths.
 
Confirmed influenza laboratory tests recived by PA DOH surveillance 

Table 1. Influenza Cases (positive by rapid test, PCR, or culture) Reported in Pennsylvania, 10/02/16 to 3/18/17 (n=59246) - Cases by County and Influenza Type*    
 
County Influenza Type TOTAL
A B U
  281 60 0 341
ADAMS 767 451 0 1218
ALLEGHENY 3000 1326 9 4335
ARMSTRONG 203 55 0 258
BEAVER 738 393 4 1135
BEDFORD 110 45 2 157
BERKS 2200 310 0 2510
BLAIR 552 180 25 757
BRADFORD 500 227 0 727
BUCKS 1650 158 2 1810
BUTLER 492 319 20 831
CAMBRIA 517 203 3 723
CAMERON 17 1 0 18
CARBON 305 64 0 369
CENTRE 735 132 0 867
CHESTER 1461 245 4 1710
CLARION 210 86 0 296
CLEARFIELD 322 223 13 558
CLINTON 143 27 0 170
COLUMBIA 38 41 0 79
CRAWFORD 582 129 0 711
CUMBERLAND 1561 384 51 1996
DAUPHIN 1555 239 0 1794
DELAWARE 2508 313 1 2822
ELK 123 40 0 163
ERIE 1546 196 1 1743
FAYETTE 605 305 1 911
FOREST 11 3 0 14
FRANKLIN 679 141 0 820
FULTON 224 106 0 330
GREENE 130 35 0 165
HUNTINGDON 651 71 2 724
INDIANA 633 191 0 824
JEFFERSON 363 115 0 478
JUNIATA 38 2 0 40
LACKAWANNA 360 203 1 564
LANCASTER 1137 157 0 1294
LAWRENCE 71 28 0 99
LEBANON 442 73 0 515
LEHIGH 2292 353 1 2646
LUZERNE 758 460 2 1220
LYCOMING 601 161 0 762
MCKEAN 121 51 0 172
MERCER 201 62 1 264
MIFFLIN 88 2 1 91
MONROE 624 92 0 716
MONTGOMERY 2160 338 11 2509
MONTOUR 1736 570 0 2306
NORTHAMPTON 2553 383 1 2937
NORTHUMBERLAND 138 27 0 165
PERRY 106 12 0 118
PHILADELPHIA 1764 146 1 1911
PIKE 121 50 0 171
POTTER 176 41 0 217
SCHUYLKILL 401 65 0 466
SNYDER 244 46 0 290
SOMERSET 221 78 46 345
SULLIVAN 15 1 0 16
SUSQUEHANNA 74 34 0 108
TIOGA 130 6 0 136
UNION 220 61 0 281
VENANGO 110 82 0 192
WARREN 98 4 0 102
WASHINGTON 1129 460 1 1590
WAYNE 341 249 0 590
WESTMORELAND 1026 404 7 1437
WYOMING 30 42 1 73
YORK 1694 837 8 2539
All 46632 12394 220 59246
  * Influenza counts are provisional and may change as more information is received.
 
Figure 1. Number of Pa. Influenza Cases by Week of First Report 
 

 Figure 2: Comparison of PA-NEDSS Influenza Cases (All Types) in Current Season to the Seven Previous Seasons
       
                                        
 Figure 3: Season-to-date Influenza Sub-Typing Results From State Public Health Lab (n=540) 
 
 

Table 2: Season-To-Date Influenza-Associated Deaths by Age
 
 
Age​ Influenza associated Death​
0-18 3
19-49 6
50-64 7
65 + 97
All​ 113
 
 

  Syndromic surveillance

The Pennsylvania Department of Health’s syndromic surveillance system receives data on visits to emergency departments (EDs) from most hospitals in the state.  The system looks at the reason for visiting the ED and determines if ED visits were likely due to influenza-like illness (ILI). The graph displays ED visits due to ILI as a percentage of total ED visits. This provides yet another way for the Department of Health to monitor influenza and ILI in the state. 

 Figure 4: season-to-date Influenza-Like Illness (ILI) Emergency Visits


Figure 5: season-to-date Influenza-Like Illness (ILI) Emergency Visits by community health districts  


Figure 6: season-to-date Influenza-Like Illness (ILI) Emergency Visits by age groups



 

World Health Organization (WHO) and National Respiratory & Enteric Virus Surveillance System (NREVSS) Collaborating Laboratories
 
Thirteen clinical virology laboratories in Pa.are WHO and/or NREVSS collaborating laboratories for influenza surveillance.
These labs report weekly the number of respiratory specimens tested and the number positive for influenza types A and B to CDC. Some labs also report the influenza A subtype (H1 or H3) and influenza B lineage (Victoria or Yamagata). Because denominator data is provided, the weekly percentage of specimens testing positive for influenza is calculated.
 
Figure 7: Influenza Test Results Reported to the National Respiratory and Enteric Virus Surveillance System (NREVSS) Select Pennsylvania Laboratories, Season to date