Arboviral Surveillance and Control Annual Report: Pennsylvania, 2014
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1 Arboviral Surveillance and Control Annual Report: Pennsylvania, 2014 Introduction Arthropod-borne viruses (arboviruses) negatively impact the health of millions around the world. Arboviral outbreaks are difficult to predict and control due to complex transmission cycles, increasing globalization and environmental impacts related to climate change. Arboviruses originating domestically (e.g., West Nile virus [WNV]) or introduced through international travel (e.g., dengue virus) constitute a potential public health threat to Pennsylvania by causing human morbidity and mortality, as well as agricultural and other economic impacts. The Pennsylvania Department of Health (DOH) leads a multi-agency team that includes the Pennsylvania Department of Environmental Protection (DEP) and the Pennsylvania Department of Agriculture (PDA) and is tasked with reducing the impact of WNV and other arboviruses in Pennsylvania through a coordinated arboviral surveillance and control program. DOH is responsible for surveillance and investigation of human arboviral infections, and DEP is responsible for mosquito surveillance and control activities, responding to and coordinating testing of deceased avian specimens and maintaining the public WNV website ( PDA facilitates testing of equine (and other veterinary) specimens for WNV and other arboviruses. In general, arboviral testing is conducted by each agency s own laboratory. This report provides a summary of arboviral surveillance and control activities in Pennsylvania from Jan. 1, 2014, through Dec. 31, Overview During 2014, WNV activity was detected in 39 of 67 counties. Thirteen human WNV disease cases were reported along with four WNV presumptive viremic donors (WNV-PVDs). Of the 13 clinically apparent WNV infections, 11 were neuroinvasive, 12 were hospitalized and 1 death was reported. Mosquito sampling and testing yielded 1,435 WNV-positive pools (8.4 percent of those collected and tested). Seventeen deceased avian specimens were WNV-positive (23 percent of those submitted and tested), and one equine specimen tested positive for WNV. No other domestic arboviruses were detected in Pennsylvania in Compared to prior years, WNV activity was consistent with the activity observed in non-epidemic years (i.e., years other than 2003 and 2012). In addition to human WNV disease cases, several travel-associated arboviral infections were reported in Pennsylvania during Eight imported dengue cases were reported, which was lower in comparison to previous years. An unprecedented 97 imported chikungunya virus disease cases were also reported, which were largely the result of a concurrent chikungunya epidemic affecting the Caribbean and Central America. No evidence of local transmission of either dengue or chikungunya virus has been documented within Pennsylvania. In response to the detection of WNV activity, a collaborative network of mosquito control services conducted over 4,000 control events covering more than 50,000 acres across Pennsylvania during 1
2 2014. In addition to these events, over 67,000 urban catch basins, which are important breeding sites for mosquitos, were treated. Surveillance Summary Human case surveillance In Pennsylvania, all human arboviral infections are reportable to DOH by clinicians and laboratories (28 Pa. Code 27.21a, 28 Pa. Code 27.22). Reports are submitted electronically to DOH through Pennsylvania s National Electronic Disease Surveillance System (PANEDSS) and assigned to public health investigators for follow-up. The most frequently reported arboviral infection in Pennsylvania is WNV, although in the past 10 years, Powassan encephalitis virus, Cache Valley virus and St. Louis encephalitis virus cases have occurred. All human case data were obtained from ArboNET, the national electronic surveillance system for arboviral diseases administered by the Centers for Disease Control and Prevention (CDC). Arboviral disease cases are initially reported into PANEDSS and then entered into the ArboNET Web application once preliminary investigation determines the case to meet the probable or confirmed case classification of the current applicable national case definition (other than WNV-PVDs, which are considered non-cases but still reported for surveillance purposes). WNV disease cases were classified according to the 2014 arboviral diseases case definition. Dengue cases were classified using the 2010 dengue case definition. Chikungunya disease cases were classified based upon unpublished guidance from CDC provided to state health departments, which is identical to the 2015 arboviral diseases case definition. Case definitions can be reviewed at: A. WNV Thirteen WNV disease cases and four WNV-PVDs were reported in The majority of WNV disease cases reported were neuroinvasive infections affecting adults older than 60 years of age. Twelve cases required hospitalization, and one fatality was reported. Eight counties reported WNV disease cases in 2014, including: Adams (1), Allegheny (1), Bedford (1), Bucks (3), Dauphin (1), Franklin (1), Montgomery (1) and Philadelphia (4). The first two WNV disease cases of the 2014 season, both of which were neuroinvasive infections, reported onset during the week ending Aug. 2, 2014 (epidemiologic week 31). Case activity peaked during the week ending Sept. 13, 2014 (epidemiologic week 37), and no WNV disease cases occurred after this week; however, three WNV-PVDs were detected during the subsequent three weeks. From , a median of nine neuroinvasive and five non-neuroinvasive WNV disease cases were reported annually in Pennsylvania. In comparison to the history of reported cases per year, 2014 case counts are comparable to previous non-epidemic years. 2
3 Table 1: Characteristics of WNV cases reported in Pennsylvania during 2014 by infection type No. Cases (percent) Characteristic Value WNV-ND a WNV-NND b WNV-PVD c Age group (in years) (0.0) 0 (0.0) 0 (0.0) (18.2) 0 (0.0) 0 (0.0) (9.1) 1 (50.0) 4 (100.0) (72.7) 1 (50.0) 0 (0.0) Sex Female 3 (27.3) 1 (50.0) 1 (25.0) Male 8 (72.7) 1 (50.0) 3 (75.0) Hospitalized Yes 11 (100.0) 1 (50.0) - No 0 (0.0) 1 (50.0) - Fatality Yes 1 (9.1) 0 (0.0) - No 10 (90.9) 2 (100.0) - Case classification Confirmed 2 (18.2) 1 (50.0) - Probable 9 (81.2) 1 (50.0) - Total Cases 11(100.0) 2 (100.0) 4 (100.0) a West Nile virus neuroinvasive disease (i.e., encephalitis, meningitis, acute flaccid paralysis, etc.) b West Nile virus non-neuroinvasive disease (i.e., West Nile fever) c West Nile virus presumptive viremic donor (asymptomatic; detected via blood donor screening) Figure 1: WNV disease cases reported in Pennsylvania during 2014 by county of case residence (WNV-PVDs are not depicted) 3
4 Figure 2: WNV disease cases reported in Pennsylvania during 2014 by epidemiologic week of onset in comparison to average number of cases from (WNV-PVDs are not depicted) Table 2: WNV cases reported in Pennsylvania from by year and infection type No. Cases WNV-ND WNV-NND WNV-PVD Year 2001 a a a a a A change in the national case definition for WNV took effect beginning this year. 4
5 B. Dengue Eight imported cases of dengue were reported in Most cases occurred in older adults; half were hospitalized and no deaths were reported. None of the dengue cases reported in 2014 were classified as severe dengue. Dengue cases reported in 2014 were residents of the following Pennsylvania counties: Allegheny (1), Berks (1), Centre (1), Chester (1), Lancaster (1), Lehigh (1), Northampton (1) and Washington (1). Cases were imported from the following locations: Costa Rica (1), Haiti (3), India (2) and the Philippines (1). Travel history was unable to be obtained on one case. Dengue case onsets ranged from the week ending Jan. 18, 2014 (epidemiologic week 3) through the week ending Sept. 6, 2014 (epidemiologic week 36). From , a median of 16 dengue cases and 0 severe dengue cases were reported annually. No record of Pennsylvania dengue cases prior to 2006 exists in ArboNET. In comparison to the history of reported cases per year, 2014 case counts were lower than normal. Table 3: Characteristics of dengue cases reported in Pennsylvania during 2014 Characteristic Value Dengue Cases (percent) Age group (in years) (12.5) (25.0) (50.0) (12.5) Sex Female 5 (62.5) Male 3 (37.5) Hospitalized Yes 4 (50.0) No 3 (37.5) Unknown 1 (12.5) Fatality Yes 0 (0.0) No 7 (87.5) Unknown 1 (12.5) Case classification Confirmed 1 (12.5) Probable 7 (87.5) Total cases 8 (100.0) 5
6 Table 4: Dengue cases reported in Pennsylvania from by year and infection type No. Cases Year Dengue fever Severe dengue a a A change in the national case definition for dengue took effect beginning this year. C. Chikungunya Virus Disease A record 97 imported non-neuroinvasive chikungunya virus disease cases were reported in Pennsylvania in Most cases occurred in older adult females; however, cases were observed in all age groups. Hospitalization occurred in 21 percent of cases, and no deaths were reported. Chikungunya virus disease cases reported in 2014 were residents of 21 different Pennsylvania counties: Allegheny (9), Berks (6), Blair (1), Bucks (3), Chester (2), Cumberland (1), Dauphin (2), Delaware (5), Fayette (3), Indiana (1), Lancaster (2), Lebanon (1), Lehigh (5), Luzerne (5), Monroe (1), Montgomery (3), Northampton (2), Philadelphia (42), Union (1), Washington (1) and Westmoreland (1). Of the 97 reported chikungunya virus disease cases in Pennsylvania in 2014, all but two were related to exposures in the Americas, where an outbreak of chikungunya began late Chikungunya virus disease cases were imported to Pennsylvania from the following locations: Anguilla (1), British Virgin Islands (1), Colombia (1), Curacao (1), Dominican Republic (42), Federation of St. Christopher and Nevis (1), Guatemala (1), Haiti (13), India (1), Indonesia (1), Jamaica (12), Puerto Rico (19), Trinidad (2) and Venezuela (1). The first chikungunya virus disease case of 2014 season reported onset during the week ending Mar. 8, 2014 (epidemiologic week 10), in association with travel to Anguilla. Activity peaked during the week ending July 5, 2014 (epidemiologic week 27), and the last case of 2014 reported onset during the week ending Nov. 22, 2014 (epidemiologic week 47), in association with travel to Colombia. Only four chikungunya virus disease cases were reported in Pennsylvania prior to The surge in imported chikungunya virus disease cases in Pennsylvania during 2014 was the result of concurrent unprecedented chikungunya virus transmission in the Caribbean islands, which began late 2013, subsequently spread to Central and South America, and infected >1 million residents in these regions. 6
7 Table 5: Characteristics of chikungunya virus disease cases reported Pennsylvania during 2014 Characteristic Value Chikungunya Virus Disease Cases (percent) Age group (in years) (10.3) (27.8) (49.5) (12.4) Sex Female 76 (78.4) Male 21 (21.7) Hospitalized Yes 20 (20.6) No 68 (70.1) Unknown 9 (9.3) Fatality Yes 0 (0.0) No 93 (95.9) Unknown 4 (4.1) Case classification Confirmed 31 (32.0) Probable 66 (68.0) Total cases 97 (100.0) Figure 3: Chikungunya virus disease cases reported in Pennsylvania during 2014 by county of case residence. 7
8 Figure 4. Chikungunya virus disease cases reported in Pennsylvania during 2014 by country of exposure. Two cases with exposure outside the Americas are not depicted. Figure 5: Chikungunya virus disease cases reported in Pennsylvania during 2014 by epidemiologic week of onset 8
9 Table 6: Chikungunya virus disease cases reported in Pennsylvania from by year. Year Chikungunya Virus Disease Cases
10 Non-human surveillance summary All non-human arbovirus surveillance data were obtained from a WNV specimen database maintained by DEP. This database serves as a single portal to collect DOH, DEP, and PDA arboviral data, which are regularly summarized on the public WNV website throughout the active mosquito surveillance season (April October). These data are also uploaded to ArboNET via xml file on a weekly basis. Mosquito and avian specimens are tested via polymerase chain reaction (PCR), and veterinary specimens are tested via IgM antibody capture enzyme-linked immunosorbant assay (ELISA), immunohistochemistry (IHC) or PCR, depending on the specimen type. The only arbovirus detected through non-human arbovirus surveillance during 2014 was WNV; however, WNV is normally the only arbovirus that is tested for, except during special surveillance projects based on the known distribution of domestic arboviruses in Pennsylvania. A. WNV Program staff collected 17,156 pools of mosquitos from 58 counties during Of these, WNV was detected in 1,435 (8.4 percent) pools collected from 38 counties. The first positives were detected the week ending May 17, 2014 (epidemiologic week 20). Statewide WNV pool positivity peaked at 19 percent during the week ending Sept. 6, 2014 (epidemiologic week 36). No positive pools were detected after the week ending Oct. 4, 2014 (epidemiologic week 40), and no additional samples were collected after the week ending Oct. 18, Based on Culex species mosquitos collected by gravid trap with a pooled sample size of at least 25, overall weekly pool positivity was similar to the average weekly positivity of prior years. A total of 74 deceased avian specimens were submitted for WNV testing. Of these, WNV was detected in 17 specimens (23 percent). Positive specimens were collected from the following counties: Bedford (1), Berks (1), Blair (2), Centre (2), Delaware (1), Erie (1), Lancaster (3), Mifflin (1), Perry (2), Snyder (1) and York (2). Collection dates of positive specimens ranged from the week ending July 19, 2014 (epidemiologic week 29), to the week ending Oct. 4, 2014 (epidemiologic week 40). The percentage of WNV-positive avian specimens was similar to previous non-epidemic years. One veterinary specimen, an equine in Lancaster County, tested positive for WNV IgM antibodies during the week ending Oct. 18, 2014 (epidemiologic week 42). The number of WNV-positive veterinary specimens was lower in 2014 compared to previous non-epidemic years. 10
11 Figure 6: WNV-positive mosquito pools collected during 2014 by Pennsylvania county. The number of WNV-positive pools in each county is depicted in parentheses. Figure 7. Percentage of WNV-positive mosquito pools collected by epidemiologic week in Pennsylvania during 2014 in comparison to the average weekly percentage positive from
12 Table 7: Summary of non-human WNV surveillance activity in Pennsylvania from , by year Mosquito Pools Deceased Avian Specimens Veterinary Specimens Year No. collected No. positive Percent positive* No. collected No. positive Percent positive No. positive , , , , ,449 1, ,415 1, , , , , , , ,572 1, ,402 1, ,914 4, ,405 1, ,156 1, *To facilitate comparability between years, the percent positive for mosquito pools is based only on Culex species mosquitos collected by gravid trap with a pooled sample size of at least
13 Mosquito Control Summary In addition to surveying both human and non-human populations for arboviral disease, Pennsylvania has taken the initiative to control it. The goal of the initiative is to limit the scope and intensity of outbreaks of disease; this is done through a collaborative network of local and state mosquito control experts operating an integrated pest management program. DEP organizes the network and partially funds mosquito control services in the 26 counties that have historically displayed the highest risk of WNV disease. In 2014, the commonwealth provided $2,093,457 in grant funding to these counties. DEP provides limited surveillance and control services for the remaining counties that do not receive grant funding. In 2014, this collaborative network of mosquito control services conducted 4,088 mosquito control events covering 51,944 acres. In addition to these events, a total of 67,208 catch basins, which are significant breeding sites for mosquitos, were treated in Pennsylvania cities. The majority (95 percent) of these treatments were used to control larval sources of mosquitoes. Figure 8: Counties receiving DEP grant funding for mosquito control activities in
14 Acknowledgments The data summarized in this document represent the combined efforts of numerous disease surveillance and control professionals across Pennsylvania employed at the municipal, county and state levels of government who are committed to protecting the health of all Pennsylvanians. 14
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