VECTOR SURVEILLANCE IN NEW JERSEY EEE, WNV, SLE and LAC CDC WEEK 27: July 5 to July 11, 2009

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1 VECTOR SURVEILLANCE IN NEW JERSEY EEE, WNV, SLE and LAC CDC WEEK 27: July 5 to July 11, 2 Prepared by Lisa M. Reed, Scott Crans, Dina Fonseca and Randy Gaugler at the Center for Vector Biology, Rutgers University. Supported by funding from the NJ State Mosquito Control Commission. SITE Culiseta melanura and Eastern Equine Encephalitis Inland / Coastal Historic Mean Current Weekly Mean Total Tested to Date* Total Pools Submitted EEE Isolations Green Bank (Burlington County) Coastal Corbin City (Atlantic County) Coastal Dennisville (Cape May County) Coastal Waterford (Camden County) Inland Centerton (Salem County) Inland Turkey Swamp (Monmouth County) Inland Glassboro (Gloucester County) Inland no collection 15 2 *Including trial run last week in May. Remarks: Culiseta melanura populations continue to be lower than historical values. Normally, at this point in time, it would not be unusual to see small increases in the populations as the second generation for these southern New Jersey populations emerge. Cooler June temperatures may have an impact on the timing of emergence for this second (and amplifying) generation (Crans and Mahmood 18 Does bi-voltinism in Culiseta melanura regulate the amplification of EEE? 8 th Proceedings of the NJMCA 1-1). No eastern equine encephalitis virus has been detected at the six traditional resting box sites to this point in time. A collection was not made in Glassboro in anticipation of moving the site. To date, 11 pools from 85 Cs. melanura mosquitoes have been sent for EEE testing from the seven resting box collections (NOTE: this value was re-adjusted from last week). Previously, Ocean County has submitted Cs. melanura samples collected from gravid and CO 2 traps while Gloucester County has sampled additional sites with resting boxes. Other species tested for EEE from resting boxes include: Aedes atlanticus, Ae. japonicus, Ae. triseriatus, Anopheles punctipennis, An. quadrimaculatus, Culex erraticus, Cx. pipiens, Cx. restuans, Cx. salinarius, Mixed Culex pools, and Cx. territans. Additional species from other trap types include: Ae. abserratus, Ae. albopictus, Ae. canadensis, Ae. triseriatus, Ae. trivittatus, Ae. sollicitans, Ae. vexans, An. bradleyi, Coquillettidia perturbans and Culiseta inornata. All 15 pools of 21 mosquitoes are reported negative for EEE virus. MFIR

2 GREEN BANK (Burlington Co.) 2 18 Year Mean June July August September October Culiseta melanura Population Graphs Coastal CORBIN CITY (Atlantic Co.) 2 24 Year Mean June July August Septe Octob DENNISVILLE (Cape May Co.) 2 2 Year Mean June July August September October WATERFORD (Camden Co.) 2 18 Year Mean June July August Septe Octob Inland CENTERTON (Salem Co.) 2 24 Year Mean June July August Septe Octob TURKEY SWAMP (Monmouth Co.) 2 Year Mean June July August Septe Octob Resting box populations of Culiseta melanura continue to track lower than recent historical trends at all sites. Patterns for this species in the Statewide Adult Mosquito Surveillance program reflect similar patterns. No EEE activity was detected. GLASSBORO (Gloucester Co.) June July August Septe Octob 15 2 Last Year

3 EEE in US (2 cumulative cases): (Red = new reported cases occurring) - equine: (AL) 4(FL) 15(GA) (LA) 1(MO) (MS) 1(VA) - mosquito: 1(LA) - sentinel: 2(AL) /wild(fl) - human: West Nile Virus West Nile in US (2 cumulative cases): Single black values indicate no change from previous week. Black values / red values equals previous week/new totals. Mosquito Pools Sentinels Horses Humans Birds Alabama Alaska Arizona 2/ 1 Arkansas 1 California 1 7/ 5 Colorado 1 2 Connecticut Delaware DC Florida 2 1 Georgia 2 Hawaii Idaho 2 counties 1 Illinois 2 /21 Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Mass. Michigan Minnesota Mississippi 1 2 Missouri +? Montana Nebraska Birds Mosquito Pools Sentinels Horses Humans Nevada 4+ 1 New Hampshire New Jersey 2 New Mexico New York 1 North Carolina North Dakota Ohio Oklahoma Oregon 1 Pennsylvania 1 5 Rhode Island South Carolina South Dakota 1/2 Tennessee 1 Texas Utah 1/1 Vermont Virginia 1+ Washington 15/ West Virginia 7 Wisconsin Wyoming Note: Some data reported by states are provisional and are subject to change. Sources for this table can be found here.

4 Protocol: New Jersey Department of Health and Senior Services (NJDHSS Public Health and Environmental Laboratories, PHEL) and the Cape May County Division of Mosquito Control tests mosquito pools using RT-PCR Taqman techniques. Mosquito Species Submitted for West Nile Virus Testing through 11 July 2 Species Pools Mosquitoes Positives MFIR Aedes abserratus 1 1 Aedes albopictus Aedes atlanticus 2 2 Aedes canadensis canadensis Aedes cantator 25 Aedes cinereus 2 7 Aedes grossbecki 5 Aedes japonicus Aedes sollicitans 5 4 Aedes sticticus 8 Aedes taeniorhynchus 58 Aedes thibaulti 5 8 Aedes triseriatus 5 1 Aedes trivittatus 1 Aedes vexans 5 78 Anopheles bradleyi 11 Anopheles punctipennis 4 1 Anopheles quadrimaculatus 742 Coquillettidia perturbans Culex erraticus 7 2 Culex pipiens Culex restuans Culex salinarius 1 1 Culex spp Culex territans 1 51 Culiseta inornata 1 2 Culiseta melanura 14 Culiseta morsitans 1 Psorophora columbiae 1 1 Psorophora ferox 4 2 State Total 27, Remarks: The number of pools positive for West Nile virus remains at two, one each from Mercer and Bergen counties. These two counties include highly urban/suburbanized areas typical of WNV activity in New Jersey. Activity last year at this time was much higher: there were 5 positive pools from 1 counties. Humans, Horses and Wild Birds: No humans have been reported positive for WNV by PHEL. For more details plus information about WNV, see the PHEL s West Nile Virus Alert and FAQ Sheets: No confirmed horse cases have occurred. No positive birds have been detected as of this week. 2 Positive Mosquito pools to date / Total Mosquito Pools Submitted This time last year* * 28 started later (at least one month) last year than in 2 2 / 24 5 / 1

5 2 Positive Birds to date / Total Birds Submitted This time last year* * 28 started later (at least one month) last year than in 2 / 1 / 2 WNV Results by County through 11 July 2 County Species Pools Mosquitoes Positives MFIR Atlantic Aedes albopictus 2 17 Aedes canadensis canadensis 4 Aedes cantator 7 Aedes grossbecki 1 8 Aedes japonicus 1 2 Aedes sticticus 2 18 Aedes taeniorhynchus 1 1 Aedes thibaulti Aedes triseriatus 1 2 Aedes vexans Anopheles bradleyi 1 Anopheles punctipennis Anopheles quadrimaculatus 2 Culex restuans 2 5 Culex salinarius 1 1 Culex spp. 2 8 Culex territans 1 1 Culiseta melanura 1 22 Bergen Aedes japonicus 1 Culex spp Burlington Aedes abserratus 1 1 Aedes albopictus 14 7 Aedes canadensis canadensis 1 7 Aedes cantator 21 Aedes cinereus 1 Aedes grossbecki 1 2 Aedes japonicus Aedes sollicitans 2 22 Aedes sticticus 1 44 Aedes taeniorhynchus 1 47 Aedes triseriatus 7 2 Aedes trivittatus 1 Aedes vexans 8 Anopheles bradleyi 2 18 Anopheles punctipennis 4 1 Coquillettidia perturbans 155 Culex pipiens 1 75 Culex restuans 1 Culex salinarius 2 24 Culex spp. 145 Culex territans 1 Culiseta inornata 1 2 Culiseta melanura 4

6 Camden 11 5 Aedes albopictus 2 8 Aedes japonicus 1 Aedes thibaulti 1 1 Aedes trivittatus 2 2 Aedes vexans 1 1 Anopheles punctipennis 8 Anopheles quadrimaculatus 4 Culex pipiens 17 Culex restuans 2 2 Culex spp. 28 Culex territans 1 1 Culiseta melanura 4 11 Cape May Aedes albopictus 1 2 Aedes canadensis canadensis 1 Aedes cantator 1 1 Aedes japonicus 7 17 Anopheles bradleyi 7 Anopheles punctipennis 4 1 Anopheles quadrimaculatus 14 1 Culex pipiens 11 7 Culex restuans 2 2 Culex salinarius 4 1 Culex spp. 1 4 Culex territans 7 2 Culiseta melanura Cumberland Aedes japonicus 1 2 Anopheles punctipennis 1 1 Culex pipiens 1 2 Culex restuans 2 Culex spp. 24 Culex territans 1 1 Culiseta melanura 1 8 Essex Aedes albopictus 2 Aedes japonicus 7 1 Aedes triseriatus Aedes vexans 4 15 Culex spp Psorophora ferox 1 2 Gloucester Aedes albopictus 15 2 Aedes atlanticus 1 1 Aedes canadensis canadensis 2 2 Aedes japonicus Aedes thibaulti 1 4

7 Aedes triseriatus 1 1 Aedes trivittatus 1 75 Aedes vexans 57 Anopheles punctipennis 8 4 Anopheles quadrimaculatus 22 Coquillettidia perturbans 2 2 Culex pipiens Culex restuans 41 Culex territans 4 Culiseta melanura 2 21 Hudson Culex spp Hunterdon 1 21 Aedes albopictus 1 45 Culex spp. 24 Mercer Aedes albopictus 25 Aedes japonicus 8 1 Aedes triseriatus 2 2 Culex erraticus 1 1 Culex pipiens 5 42 Culex restuans Culex salinarius 2 2 Culex spp Middlesex Aedes japonicus 15 Culex spp Monmouth 8 7 Aedes albopictus 1 77 Aedes canadensis canadensis Aedes cantator 7 Aedes japonicus 1 Aedes triseriatus Aedes trivittatus Aedes vexans 5 4 Anopheles punctipennis Anopheles quadrimaculatus 1 1 Coquillettidia perturbans 11 Culex erraticus 1 2 Culex pipiens 1 1 Culex restuans 22 Culex spp Culex territans 2 2 Culiseta melanura 1 8 Morris 15 Aedes japonicus 5 Culex spp Ocean

8 Aedes albopictus 14 4 Aedes atlanticus 1 1 Aedes canadensis canadensis Aedes cantator 7 27 Aedes cinereus 1 1 Aedes grossbecki 1 1 Aedes japonicus 18 Aedes sollicitans Aedes sticticus Aedes taeniorhynchus 1 1 Aedes triseriatus 1 Aedes trivittatus 1 1 Aedes vexans 15 4 Anopheles bradleyi 2 2 Anopheles punctipennis 7 Coquillettidia perturbans 5 Culex restuans 2 2 Culex salinarius 5 42 Culex spp Culiseta melanura 5 1 Psorophora columbiae 1 1 Psorophora ferox 2 21 Passaic 7 8 Aedes albopictus 1 7 Aedes canadensis canadensis 1 2 Aedes japonicus 7 77 Aedes triseriatus 2 Culex spp Salem 5 7 Aedes albopictus 4 24 Aedes japonicus 2 Aedes triseriatus 1 1 Aedes vexans 2 15 Anopheles punctipennis 5 17 Anopheles quadrimaculatus Coquillettidia perturbans 2 4 Culex restuans 2 2 Culex spp. 28 Culex territans 2 2 Culiseta melanura 21 1 Somerset 7 21 Aedes albopictus 1 2 Aedes canadensis canadensis 1 7 Aedes japonicus 11 1 Aedes triseriatus 1 Aedes trivittatus Aedes vexans 1 5 Anopheles punctipennis 1 2 Coquillettidia perturbans 2 Culex spp Psorophora ferox 1

9 Sussex Aedes japonicus Coquillettidia perturbans 4 Culex pipiens 7 Culex restuans 1 Culex salinarius Culex spp Culiseta melanura 1 Culiseta morsitans 1 Union Aedes japonicus 4 Culex spp. 157 Warren 8 84 Culex spp Grand Total 275, Cumulative activity in 28 Activity last week Recent Activity to 11July 2

10 WNV Risk of Exposure Model This is Phase 1 of our WNV Risk Exposure model presentation. Our WNV risk model begins with a simple linear relationship we have found between overall mosquito MFIR values and the number of human cases that appeared two weeks later. This relationship was developed using statewide values from 22 to 2. The regression model, graphed to the left, explains over 5% of the variation observed. We ve continued to explore the variables that contribute to WNV cases, and will present more precise models on this page in the future. Using ArcMap.2, we applied this linear relationship of overall mosquito MFIR values at the county level to calculate a risk of exposure. Since this calculation was for the county as a whole, each county point was fixed within the county using the county seat (green diamond symbols). The values used in the linear regression were reported during Week 25 (the two week lag) of the Vector Surveillance Program from the WNV Results By County table. Risk is rated from minimal exposure (no positive pools found) through to high risk (positive mosquitoes found) with several risk levels in between. Risk is interpolated from each of the 21 county points in equal gradients. It should be noted that minimal risk does not mean no risk and that high risk cannot be mediated by mosquito bite avoidance behavior. Areas of higher risk are noted in Bergen and Mercer counties. These are both counties that reported a single positive Culex pool during the past few weeks. Because Bergen County had fewer overall mosquitoes submitted, their risk value for the same number of positive mosquito pools (i.e., 1) is higher than for Mercer County. NOTE: These maps are presented as an additional early warning tool available for counties to use as part of their decision making processes for controlling public-health mosquitoes. It should be understood that minimal risk does not mean no risk and that everyone should use personal protection to avoid mosquito bites.

11 Saint Louis Encephalitis (SLE) through 11 July 2. New Jersey will be selectively testing for SLE this year. SLE has had previous activity in New Jersey, most notably in 14 and 175 (CDC s SLE website), the latter prompting the surveillance reporting by Rutgers. SLE is a flavivirus and has a similar transmission pattern to West Nile, with Culex species as the predominant vectors. County Species Pools Mosquitoes Positives MFIR Burlington Aedes abserratus 1 1 Aedes albopictus 14 7 Aedes canadensis canadensis 4 52 Aedes cinereus 2 2 Aedes cantator 1 Aedes japonicus 1 4 Aedes sollicitans 2 22 Aedes taeniorhynchus 1 47 Aedes triseriatus 28 Aedes trivittatus 1 Aedes vexans 8 14 Anopheles bradleyi 2 18 Anopheles punctipennis 2 4 Coquillettidia perturbans 155 Culex pipiens 1 75 Culex restuans 1 Culex salinarius 2 24 Culex spp. 4 1 Culiseta inornata 1 2 Culiseta melanura 11 1 Camden Aedes japonicus 1 7 Aedes vexans 1 1 Culex pipiens 2 5 Culex spp Cape May 152 Aedes cantator 1 2 Aedes triseriatus 2 11 Anopheles quadrimaculatus 1 1 Coquillettidia perturbans 1 1 Culex pipiens Culex restuans 54 7 Culex spp Essex Aedes albopictus 2 Aedes japonicus 7 1 Aedes triseriatus Aedes vexans 4 15 Culex spp Psorophora ferox 1 2

12 Mercer 15 2 Aedes albopictus 25 Aedes japonicus 4 Aedes triseriatus 2 2 Culex pipiens 47 1 Culex restuans 1 Culex spp Specimens submitted by the counties continue to be negative for SLE. La Crosse Encephalitis (LAC) through 11 July 2. New Jersey will be selectively testing for La Crosse (LAC) virus this year. New Jersey has had cases of this encephalitic disease since 14 (see CDC s LAC website). The mortality is low but like other encephalitides, LAC can have both personal (lasting neurological sequelae) and economic impacts. LAC is a bunyavirus with a transmission cycle involving mosquitoes such as Aedes triseriatus and small mammals such as squirrels and chipmunks. LAC can also infect Aedes albopictus and transovarial transmission was demonstrated (Tesh and Gubler 175 Laboratory studies of transovarial transmission of La Crosse and other arboviruses by Aedes albopictus and Culex fatigans. American Journal of Tropical Medicine and Hygeine 24(5):87-88). County Species Pools Mosquitoes Positives MFIR Cape May 45 1 Aedes albopictus 1 21 Aedes japonicus 25 8 Aedes triseriatus 1 41