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Eastern Equine Encephalomyelitis Virus and Culiseta Melanura Activity at the Patuxent Wildlife Research Center, 1985 90

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Eastern Equine Encephalomyelitis Virus and Culiseta Melanura Activity at the Patuxent Wildlife Research Center, 1985 90 328 JounNar, oF THE AlrnnrceN Moseurto CoNrnor, Assocrlrror.t VoL. 8, No. 3 EASTERN EQUINE ENCEPHALOMYELITIS VIRUS AND CULISETA MELANURA ACTIVITY AT THE PATUXENT WILDLIFE RESEARCH CENTER, 1985_90 BENEDICT B. PAGAC,I MICHAEL J. TURELL' ero GLENN H. OLSEN3 ABSTRACT. Mosquito population densities, virus isolations and seroconversionin sentinel quail were used to monitor eastern equine encephalomyelitisvirus (EEE) activity at the Patuxent Wildlife Research Center, Laurel, Maryland, from 1985 through 1990. A dramatic increase in the number of Culiseta mclanura collected in 1989, as comparedwith the 3 previous years, was associatedwith virus isolations from this species(5/75 pools; n : 542 mosquitoes)and with seroconversionin sentinel quail (4/22bids positive). This was the first detection of EEE virus activity in this area since a 1984 EEE outbreakkilled 7 whoopinscranes. During 1984, an outbreak of eastern equine ice. In 1985, four SSAM trapping sites were encephalomyelitis (EEE) virus occurred among establishedalong the Big Patuxent River flood birds at the Patuxent Wildlife ResearchCenter plain, within a 3.2 km radius of the crane pens. (PWRC), in Laurel, MD (Dein et al. 1986;Car- These consisted of 2 pairs of sites separatedby penter et al. 1987,1989). Of 39 whoopingcranes 3,000 meters. Within each pair, trapping loca- [Grus americono (Linn.)] at the PWRC, 21 tions were approximately 700 m apart. These 4 (54%) had,evidence of infection with EEE virus, sites were used from 1985-90, and trapping and 7 (33%) of the infected birds died (Dein et methods remained the same throughout this al. 1986). These deaths were of particular con- period. Mosquitoes were trapped 2 nights per cern becausethe whooping crane is an endan- week. Trap indices [number Cs. melnnura co|- geredspecies, and the PWRC is one of 2 research Iected/(number of traps x number of nights)l facilities devotedto the propagation of this spe- were calculated each week from August through cies. Septemberof each year. In the eastern United States. EEE virus is Female mosquitoeswere identified to species transmitted among birds by the mosquito Culi- and counted from 1985to 1990,but only assayed seta mehnura (Coq.), and the virus can cause for virus in 1985,1989 and 1990.Mosquitoes for severe disease or death in horses, game birds viral assay were frozen at -70" C in pools of and humans (Morris 1989). Mosquito surveil- <25 specimensof eachspecies until tested.Pools Iance at PWRC was initiated in late 1984, but of mosquitoeswere triturated in 2 ml of diluent no adult Cs. melnnura were collected that year (2% fetal bovine serumin Hanks'balancedsalt becausetrapping occurred after the first frost solution with HEPES buffer, antibiotics and (Dein et al. 1986, Carpenter et al. 1987). Fur- NaHCOa) and tested for infectious virus by thermore, EEE virus was not detectedfrom over plaque assay on Vero cell monolayers. Seed 900 Cs. melanura collected in the vicinity of stocks were made from all positive suspensions (Scott PWRC in 1985 et al. 1987). and the identity of viruses recoveredwas con- Becauseof the potential impact of EEE virus firmed by a plaque-reductionneutralization test on the whooping crane recovery program, the (Earley et al. 1967) with antisera directed risk of human and equine diseaseand the prox- against the prototype strains of EEE, Highlands imity of PWRC to Fort GeorgeG. Meade, MD, J (HJ) and Jamestown Canyon (JC) viruses. mosquito surveillance was conducted annually Virus transmission to avian hosts was moni- at PWRC from 1985 to 1990 to monitor mos- tored with sentinel bobwhite quail uir- quito population lColinus densities and virus activity. ginianus (Linn.)]. Five to 7 seronegativequail Mosquitoes were collected with solid-state were placed in wire cagesin the vicinity of each army miniature (SSAM) (John light traps W. of the four mosquito traps and bled monthly Hock Co., Gainesville, FL) augmentedwith dry from September through November. Sera ob- tained from these birds were tested for neutral- izing antibody to EEE virus (Earley et al. 1967). 'U.S. Army Environmental Hygiene Activity- Culiseta rnelanura populations generally re- North, Entomological SciencesDivision, Fort George = G. Meade,MD 20755. mained low (mean 2.9 mosquitoes/trap night) 2Department of Epidemiology,Disease Assessment from 1986 through 1988 (Fig. 1). However, a Division, United States Army Medical Research In- significantly (2-way ANOVA test, P < 0.001) stitute of Infectious Diseases,Fort Detrick, Frederick, greater number of Cs. rnelanura wete collected MD 21702. per trap night 3 during the 1989trapping season, Patuxent Wildlife ResearchCenter, U.S. Fish and with a peak trap index of 28.4 in the third week Wildlife Service.Laurel. MD 20708. of September. In contrast, the weekly trap in- SEPTEMBER1992 OpnRltlour, AND ScrENTrFrcNorps 329 Four virus isolates (all HJ virus, a subtype of o) western equine encephalomyelitis virus), how- ever,were obtained from 3 pools of Cs.mclnnura (447 pool :10 tested) and one of Cubx enaticus !s (Dyar and Knab) (310 tested). No virus was recoveredfrom any of 820 Cq.perturbans tested. + Q) Similar to the pattern observedin mosquitoes, Es no EEE virus activity was detected from 1985 o6 through 1988 in sentinel quail (Table 1). Al- o though half of the sentinel quail cages were o destroyed by vandals before complete results z 86 87 88 89 90 86 87 88 89 90 could be obtained for 1989, neutralizing anti- August September body to EEE virus was first detected in sera Month ot Collection obtained from 4 (18%) ot the 22 quail on 26 Fig. 1. Mean numbers of female Culiseta melanura September. One quail had a titer of 1:16 on collected per trap night in dry ice-augmented solid- September 26, but died before the next bleed. state army miniature light traps are shown by month When rebled on November 15, sera from the 3 of collection for 1986 throueh 1990. surviving seropositive quail neutralized 80% of the plaquesat dilutions of 1:64(n = 1) and 1:128 dicesfor Cs.melanura never exceeded10 in the (n: 2). None of the 22 sentinelquail in 1990 3 previousyears. seroconvertedfor EEE virus. A total of 452Cs. rnelanura. collected between In summary, we detected EEE virus activity September 11 and November 14, 1989, were in 1989 in the vicinity of the PWRC, both by tested in 75 pools; five pools (l% of the Cs. isolating virus from field-collectedCs. rnelanura rnelanura) yielded EEE virus isolates (Table 1). and by noting seroconversionin sentinel quail. Virus was recoveredfrom mosquitoes collected This was the first documentation of EEE virus on September11, 18, 25 (2 isolates),and Novem- activity in this area sincethe 1984epizootic that ber 7. In addition, Il7 Coquilbttidia perturbans killed 7 whooping cranes. The proximity of the Walker were collected between September 11 current outbreak to the whooping crane breed- and 25, 1989.These were pooled (<l0/pool) and ing facility raised concern about possible infec- assayedas described above. One isolate of JC tion ofthis speciesand provided an opportunity virus wasobtained from a pool (n: 10)collected to examinethe efficacy of the EEE virus vaccine on September11, 1989.All viruseswere reiso- which is being administered to these birds lated from the original mosquito suspensions (Clark et al. 1987). Currently, a study is in and their identity confirmed by a plaque-neu- progressto evaluate the EEE viral exposure of tralization test. whooping cranes that occurred during the 1989 Comparatively large numbers of Cs, melnnura EEE outbreak. (mean trap index : 8.9) were again collected in AIso, in the years after both the 1984and 1989 1990,but, as occurred after the 1984 EEE out- EEE virus outbreaks, EEE virus activity was break. there was no evidenceof EEE virus activ- not detected,despite relatively Iargepopulations ity during the year following an EEE outbreak. of Cs. rnelanuro present during each of these Table 1. Surveillance for eastern equine encephalomyelitisvirus activity at the Patuxent Wildlife ResearchCenter from 1985through 1990. Sentinel quail Culiseta melanura Year No. (% positive) Trap indexl No. tested' No. positive' 1985 25(0%) 10.5(64) 888(116) 0 1986 20(o%) 4.8 (72) Not tested Not tested 1987 20(0%) r.6 (72) Not tested Not tested r988 20(o%\ 2.2(72) Not tested Not tested 1989 22(r8%)^ tr.1 (72) 452 (75) 5 (1:90) 1990 22(0%) 8.9(72) 447 (70) 0 I Trap index : number of Cs. rnelanuro collected during August and September/no. trap nights (number trap nights). 2 Number of Cs. melnnura tested (no. of pools tested). 3 Number of isolations (minimum field-infection rate). a Some of the cages holding sentinel quail were destroyed by vandals after the September 26, 1989 bleed, thus the 18% renresents a minimal infection rate. 330 JourNer, oF THE AunnrcnN Moseurro Cor.ITRor,Assocrl'uoN Vor,.8, No. 3 years. One possible explanation for the lack of efforts to recover the endangeredwhooping crane, detectable EEE activity during the year afber pp. 115-120. .In: International Council for Bird each major outbreak is that widespread immu- Preservation Technical Publication No. 10, Cam- bridge, England. nity, developedin the avian population during Carpenter,J. W., F. J. Dein and G. G. Clark. 1987.An each of the epizootics,prevented or hindered a outbreak of eastern equine encephalitis virus in renewedoutbreak in the subsequentyear. captive whooping cranes, pp. 123-127.In: J. C. We thank R. Tammariello for his technical Lewis (ed.), Proceedingsof the 1985 Crane Work- assistancein conducting the various virus as- shop. Platte River Whooping Crane Habitat Main- says; M. Brosnihan, S. Doran, C. Ellison, H. tenance Trust and U. S. Fish and Wildlife Service, Harlan, C. Hildebrandt, J. Holzinger, J. Jack- Grand Island, NE. son, K. Ratdke, P. Ross, P. Sandridge and R. Clark, G. G., F.
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