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Skip Navigation LinksPennsylvania Department of Health > My Health > A-Z Health Topics > I-L > 2016/2017 Influenza Season

 

This report represents the final surveillance report for the 2016-2017 influenza season. The weekly report for the 2017-2018 season will being in October.

 

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: SPORADIC (week 21 ending May 27, 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 and continued to decrease for MMWR week 21.
- Flu activity for MMWR week 21 was low in all the state regions.
- Pennsylvania’s current influenza activity code is "SPORADIC"
- The first influenza associated death was reported during week 44. No flu associated deaths have been reported during week 21 and total influenza associated death reports season to date is 148, including four 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 5/27/17 (n=70800) - Cases by County and Influenza Type*    
 
County Influenza Type TOTAL
A B U
  390 60 0 450
ADAMS 969 654 0 1623
ALLEGHENY 3234 1758 9 5001
ARMSTRONG 226 86 0 312
BEAVER 766 464 4 1234
BEDFORD 118 114 2 234
BERKS 2359 672 0 3031
BLAIR 621 386 29 1036
BRADFORD 535 280 0 815
BUCKS 1775 450 2 2227
BUTLER 521 380 20 921
CAMBRIA 582 344 3 929
CAMERON 23 8 0 31
CARBON 318 101 0 419
CENTRE 765 219 0 984
CHESTER 1671 541 4 2216
CLARION 220 118 0 338
CLEARFIELD 356 280 13 649
CLINTON 147 55 0 202
COLUMBIA 43 50 0 93
CRAWFORD 623 265 0 888
CUMBERLAND 1697 664 51 2412
DAUPHIN 1702 388 0 2090
DELAWARE 2801 826 1 3628
ELK 140 72 0 212
ERIE 1720 377 1 2098
FAYETTE 654 443 1 1098
FOREST 11 10 0 21
FRANKLIN 708 285 0 993
FULTON 227 190 0 417
GREENE 143 59 0 202
HUNTINGDON 674 197 2 873
INDIANA 700 307 0 1007
JEFFERSON 383 165 0 548
JUNIATA 40 5 0 45
LACKAWANNA 370 234 1 605
LANCASTER 1261 413 0 1674
LAWRENCE 75 42 0 117
LEBANON 462 173 0 635
LEHIGH 2361 515 1 2877
LUZERNE 800 508 2 1310
LYCOMING 619 221 0 840
MCKEAN 137 82 0 219
MERCER 210 84 1 295
MIFFLIN 96 18 1 115
MONROE 652 168 0 820
MONTGOMERY 2365 742 40 3147
MONTOUR 1955 762 0 2717
NORTHAMPTON 2628 663 1 3292
NORTHUMBERLAND 144 45 0 189
PERRY 109 19 0 128
PHILADELPHIA 1899 427 1 2327
PIKE 123 71 0 194
POTTER 191 78 0 269
SCHUYLKILL 415 132 0 547
SNYDER 268 74 0 342
SOMERSET 236 126 56 418
SULLIVAN 16 2 0 18
SUSQUEHANNA 86 42 0 128
TIOGA 135 20 0 155
UNION 228 75 0 303
VENANGO 116 146 0 262
WARREN 117 18 0 135
WASHINGTON 1211 643 1 1855
WAYNE 373 292 0 665
WESTMORELAND 1118 511 11 1640
WYOMING 39 45 1 85
YORK 1926 1266 8 3200
All 50603 19930 267 70800
  * 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=586) 
 
 

Table 2: Season-To-Date Influenza-Associated Deaths by Age
 
 
Age​ Influenza associated Death​
0-18 4
19-49 8
50-64 16
65 + 120
All​ 148
 
 

  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