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2015/16 Influenza Season data

 
The June-25, 2016 (MMWR week 25) flufreepa.com report marks the final full influenza surveillance report for the 2015-2016 flu season in Pennsylvania. Currently, flu activity is low and no reporting will be provided. When flu season begins in the fall (September 1st, 2016), the Bureau of Epidemiology will resume updating this page.
 

 
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 2015/16 season, the influenza surveillance season began on Oct. 10, 2015, and will run through May 21, 2016. 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 5 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: SPORADIC (week 25 ending June 25, 2016)
*The flu code is a characterization of the geographic spread of influenza in Pennsylvania. It does not tell how bad one season compares to another. Rather, it shows the level of influenza activity in Pennsylvania counties. 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 weeks run from week 40 (which ends Oct. 10, 2015) through week 52 (at the end of 2015) and up from week one (in January of 2016) to week 39 (late September of 2016). The data presented below reflect influenza activity during each of the surveillance weeks referred to above and 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 decrease in influenza activity.
- Activity was highest in the southeastern part of the state.
- Influenza activity code is "SPORADIC".
- No influenza associated deaths reported for MMWR week 25, the total season to date count of influenza associated deaths is 64.
 
Table 1. Influenza Cases (positive by rapid test, PCR, or culture) Reported in Pennsylvania, 10/03/15 to 6/25/16 (n= 31888) - Cases by County and Influenza Type*    
 
County Influenza Type TOTAL
A B U
  60 65 8 133
ADAMS 330 205 0 535
ALLEGHENY 2129 924 85 3138
ARMSTRONG 123 38 3 164
BEAVER 356 165 1 522
BEDFORD 34 10 1 45
BERKS 1044 615 0 1659
BLAIR 199 55 0 254
BRADFORD 60 9 0 69
BUCKS 786 564 6 1356
BUTLER 373 155 32 560
CAMBRIA 180 55 1 236
CAMERON 6 3 0 9
CARBON 79 52 0 131
CENTRE 291 255 1 547
CHESTER 640 278 6 924
CLARION 125 26 0 151
CLEARFIELD 199 148 2 349
CLINTON 13 11 0 24
COLUMBIA 109 53 0 162
CRAWFORD 274 50 0 324
CUMBERLAND 632 407 1 1040
DAUPHIN 516 180 3 699
DELAWARE 938 474 0 1412
ELK 33 16 0 49
ERIE 568 172 0 740
FAYETTE 187 79 1 267
FOREST 8 3 0 11
FRANKLIN 371 193 0 564
FULTON 55 58 0 113
GREENE 61 19 0 80
HUNTINGDON 46 56 0 102
INDIANA 332 99 1 432
JEFFERSON 84 89 0 173
JUNIATA 46 53 0 99
LACKAWANNA 311 153 0 464
LANCASTER 508 228 5 741
LAWRENCE 133 25 0 158
LEBANON 93 99 0 192
LEHIGH 1102 481 19 1602
LUZERNE 768 261 1 1030
LYCOMING 95 50 1 146
MCKEAN 94 15 0 109
MERCER 79 30 1 110
MIFFLIN 119 178 0 297
MONROE 226 74 2 302
MONTGOMERY 1116 578 8 1702
MONTOUR 49 36 0 85
NORTHAMPTON 1263 865 27 2155
NORTHUMBERLAND 186 103 1 290
PERRY 34 22 1 57
PHILADELPHIA 1178 485 0 1663
PIKE 84 18 1 103
POTTER 75 17 0 92
SCHUYLKILL 241 159 0 400
SNYDER 83 40 1 124
SOMERSET 94 50 22 166
SULLIVAN 5 1 0 6
SUSQUEHANNA 40 10 0 50
TIOGA 55 10 0 65
UNION 108 74 0 182
VENANGO 41 12 0 53
WARREN 59 17 0 76
WASHINGTON 575 227 1 803
WAYNE 149 72 1 222
WESTMORELAND 329 118 32 479
WYOMING 33 8 0 41
YORK 544 305 1 850
All 21156 10455 277 31888
 
* 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=498) 
 
 
 

Table 2: Season-To-Date Influenza-Associated Deaths by Age
 
 
Age​ Influenza associated Death​
0-18 0
19-49 7
50-64 20
65 + 37
All​ 64
 
 

Figure 4: Comparison of Influenza-Like Illness (ILI) Emergency Visits in the Current Season to the Six Previous Seasons.


 

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.