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2015/16 Influenza Season data

 
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: REGIONAL (week 20 ending May 21, 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 southwestern part of the state.
 
- Influenza activity code is "Regional".
 
- No influenza associated deaths were reported for MMWR week 20, the total season to date count of influenza associated deaths is 63.
 
- It is not too late to be vaccinated against influenza.

Table 1. Influenza Cases (positive by rapid test, PCR, or culture) Reported in Pennsylvania, 10/03/15 to 5/21/16 (n= 31400) - Cases by County and Influenza Type* 
     
County Influenza Type TOTAL
A B U
  60 65 8 133
ADAMS 328 203 0 531
ALLEGHENY 2117 893 85 3095
ARMSTRONG 123 38 3 164
BEAVER 351 150 1 502
BEDFORD 34 10 1 45
BERKS 1040 598 0 1638
BLAIR 198 50 0 248
BRADFORD 60 9 0 69
BUCKS 785 546 6 1337
BUTLER 372 142 31 545
CAMBRIA 178 51 1 230
CAMERON 6 3 0 9
CARBON 78 52 0 130
CENTRE 288 251 1 540
CHESTER 634 270 6 910
CLARION 124 24 0 148
CLEARFIELD 197 141 2 340
CLINTON 13 10 0 23
COLUMBIA 109 53 0 162
CRAWFORD 273 49 0 322
CUMBERLAND 631 391 0 1022
DAUPHIN 516 177 3 696
DELAWARE 935 449 0 1384
ELK 33 16 0 49
ERIE 567 163 0 730
FAYETTE 185 78 1 264
FOREST 8 3 0 11
FRANKLIN 368 187 0 555
FULTON 55 47 0 102
GREENE 61 19 0 80
HUNTINGDON 46 54 0 100
INDIANA 331 99 1 431
JEFFERSON 84 81 0 165
JUNIATA 46 49 0 95
LACKAWANNA 309 142 0 451
LANCASTER 507 221 5 733
LAWRENCE 132 23 0 155
LEBANON 93 97 0 190
LEHIGH 1098 466 19 1583
LUZERNE 766 241 1 1008
LYCOMING 92 47 1 140
MCKEAN 94 15 0 109
MERCER 79 28 1 108
MIFFLIN 119 172 0 291
MONROE 225 74 2 301
MONTGOMERY 1090 562 8 1660
MONTOUR 49 36 0 85
NORTHAMPTON 1261 847 26 2134
NORTHUMBERLAND 186 102 1 289
PERRY 34 23 1 58
PHILADELPHIA 1171 471 0 1642
PIKE 83 17 1 101
POTTER 75 17 0 92
SCHUYLKILL 235 155 0 390
SNYDER 83 37 1 121
SOMERSET 93 50 22 165
SULLIVAN 5 1 0 6
SUSQUEHANNA 40 9 0 49
TIOGA 53 10 0 63
UNION 108 64 0 172
VENANGO 41 10 0 51
WARREN 59 17 0 76
WASHINGTON 574 224 1 799
WAYNE 147 71 1 219
WESTMORELAND 327 115 32 474
WYOMING 33 8 0 41
YORK 540 298 1 839
All 21035 10091 274 31400
 
* 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=493) 
 
 
 

Table 2: Season-To-Date Influenza-Associated Deaths by Age
 
 
Age​ Influenza associated Death​
0-18 0
19-49 6
50-64 20
65 + 37
All​ 63
 
 

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.