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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 7 ending February 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 continues to be high for MMWR week 7.
- Highest activity for week 7 has been reported in southeast region.
- Pennsylvania’s current influenza activity code is "WIDESPREAD."
- The first influenza associated death was reported during week 44. 13 flu associated death have been reported during week 7 and total influenza associated death reports season to date is 64, including two 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 2/18/17 (n=40494) - Cases by County and Influenza Type*    
 
County Influenza Type TOTAL
A B U
  281 59 0 340
ADAMS 528 150 0 678
ALLEGHENY 2477 718 9 3204
ARMSTRONG 145 22 0 167
BEAVER 607 252 4 863
BEDFORD 102 7 2 111
BERKS 1799 150 0 1949
BLAIR 444 64 24 532
BRADFORD 258 108 0 366
BUCKS 1139 57 0 1196
BUTLER 378 206 19 603
CAMBRIA 382 69 2 453
CAMERON 10 0 0 10
CARBON 249 22 0 271
CENTRE 588 53 0 641
CHESTER 933 102 3 1038
CLARION 135 26 0 161
CLEARFIELD 209 106 10 325
CLINTON 120 4 0 124
COLUMBIA 33 41 0 74
CRAWFORD 463 54 0 517
CUMBERLAND 992 170 0 1162
DAUPHIN 1232 109 0 1341
DELAWARE 1618 104 1 1723
ELK 51 11 0 62
ERIE 1043 82 1 1126
FAYETTE 503 165 1 669
FOREST 11 1 0 12
FRANKLIN 569 59 0 628
FULTON 170 28 0 198
GREENE 108 11 0 119
HUNTINGDON 501 17 2 520
INDIANA 443 65 0 508
JEFFERSON 181 73 0 254
JUNIATA 35 2 0 37
LACKAWANNA 230 143 1 374
LANCASTER 861 56 0 917
LAWRENCE 51 19 0 70
LEBANON 313 30 0 343
LEHIGH 1729 202 1 1932
LUZERNE 561 384 2 947
LYCOMING 430 51 0 481
MCKEAN 71 5 0 76
MERCER 147 25 1 173
MIFFLIN 80 1 0 81
MONROE 539 47 0 586
MONTGOMERY 1568 152 11 1731
MONTOUR 1050 297 0 1347
NORTHAMPTON 2042 201 1 2244
NORTHUMBERLAND 109 12 0 121
PERRY 69 3 0 72
PHILADELPHIA 1212 47 0 1259
PIKE 93 37 0 130
POTTER 102 9 0 111
SCHUYLKILL 325 22 0 347
SNYDER 188 13 0 201
SOMERSET 174 29 34 237
SULLIVAN 12 0 0 12
SUSQUEHANNA 33 20 0 53
TIOGA 94 2 0 96
UNION 157 22 0 179
VENANGO 80 43 0 123
WARREN 96 1 0 97
WASHINGTON 884 201 1 1086
WAYNE 209 200 0 409
WESTMORELAND 838 246 6 1090
WYOMING 15 37 1 53
YORK 1123 403 8 1534
All 34222 6127 145 40494
  * 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=416) 
 
 

Table 2: Season-To-Date Influenza-Associated Deaths by Age
 
 
Age​ Influenza associated Death​
0-18 2
19-49 3
50-64 6
65 + 53
All​ 64
 
 

  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