Murray Valley encephalitis virus surveillance and control initiatives in Australia:
A report on behalf of the National Arbovirus Advisory Committee of the Communicable Diseases Network Australia
DOI:
https://doi.org/10.33321/cdi.2001.25.7Keywords:
Murray Valley encephalitis virus, surveillance, control measures, National Arbovirus Advisory CommitteeAbstract
Mechanisms for monitoring Murray Valley encephalitis (MVE) virus activity include surveillance of human cases, surveillance for activity in sentinel animals, monitoring of mosquito vectors and monitoring of weather conditions. The monitoring of human cases is only one possible trigger for public health action and the additional surveillance systems are used in concert to signal the risk of human disease, often before the appearance of human cases. Mosquito vector surveillance includes mosquito trapping for speciation and enumeration of mosquitoes to monitor population sizes and relative composition. Virus isolation from mosquitoes can also be undertaken. Monitoring of weather conditions and vector surveillance determines whether there is a potential for MVE activity to occur. Virus isolation from trapped mosquitoes is necessary to define whether MVE is actually present, but is difficult to deliver in a timely fashion in some jurisdictions. Monitoring of sentinel animals indicates whether MVE transmission to vertebrates is actually occurring. Meteorological surveillance can assist in the prediction of potential MVE virus activity by signaling conditions that have been associated with outbreaks of Murray Valley encephalitis in humans in the past. Predictive models of MVE virus activity for south-eastern Australia have been developed, but due to the infrequency of outbreaks, are yet to be demonstrated as useful for the forecasting of major outbreaks. Surveillance mechanisms vary across the jurisdictions. Surveillance of human disease occurs in all States and Territories by reporting of cases to health authorities. Sentinel flocks of chickens are maintained in 4 jurisdictions (Western Australia, the Northern Territory, Victoria and New South Wales) with collaborations between Western Australia and the Northern Territory. Mosquito monitoring complements the surveillance of sentinel animals in these jurisdictions. In addition, other mosquito monitoring programs exist in other States (including South Australia and Queensland). Public health control measures may include advice to the general public and mosquito management programs to reduce the numbers of both mosquito larvae and adult vectors. Strategic plans for public health action in the event of MVE virus activity are currently developed or being developed in New South Wales, the Northern Territory, South Australia, Western Australia and Victoria. A southern tri-State agreement exists between health departments of New South Wales, Victoria and South Australia and the Commonwealth Department of Health and Aged Care. All partners have agreed to co-operate and provide assistance in predicting and combating outbreaks of mosquito-borne disease in south-eastern Australia. The newly formed National Arbovirus Advisory Committee is a working party providing advice to the Communicable Diseases Network Australia on arbovirus surveillance and control. Recommendations for further enhancement of national surveillance for Murray Valley encephalitis are described. Commun Dis Intell 2001;25:33-47.
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References
Mackenzie JS, Lindsay MD, Coelen RJ, Broom AK, Hall RA, Smith DW. Arboviruses causing human disease in the Australasian zoogeographic region. Archives of Virology 1974; 136:447-467.
Mackenzie JS, Broom AK, Hall RA, Johansen CA, Lindsay MD, Phillips DA, et al. Arboviruses in the Australian region, 1990 to 1998. Commun Dis Intell 1998;22:93-100.
Mackenzie JS, and AK Broom. Old river irrigation area: the effect of dam construction and irrigation on the incidence of Murray Valley encephalitis virus. Water Resources - Health, Environment and Development. BH Kay (ed). Spon, London, 1998; pp108-122.
Mackenzie JS, Broom AK. Australian X disease, Murray Valley encephalitis and the French connection. Veterinary Microbiology 1995;46:79-90.
Forbes JA. Murray Valley encephalitis 1974. also The epidemic variance since 1914 and predisposing rainfall patterns. Sydney: Australasian Medical Publishing Co Ltd,1978.
Bennett NM. Murray Valley encephalitis, 1974: clinical features. Med J Aust 1976;2:446-50.
Marshall ID. Murray Valley and Kunjin encephalitis. Monath TP (ed) The arboviruses: epidemiology and ecology, Vol III. CRC Press, Boca Raton 1988 pp152-186.
Mackenzie JS, Smith DW, Broom AK, Bucens MR. Australian encephalitis in Western Australia, 1978-1991. Med J Aust 1993; 158:591-595.
Burrow JNC, Whelan PI, Kilburn CJ, Fisher DA, Currie BJ, Smith DW. Australian encephalitis in the Northern Territory: clinical and epidemiological features, 1987-1996. Aust NZ J Med 1998;28:590-596.
Anderson SG, Donnelley M, Stevenson WJ, Caldwell NJ, Eagles M. Murray Valley encephalitis: surveys of human and animal sera. Med J Aust 1952;1:110-4.
Russell RC. Arboviruses and their vectors in Australia: an update on the ecology and epidemiology of some mosquito-borne arboviruses. Rev of Med Vet Entomol 1995;83:141-158.
Cordova SP, Smith DW, Broom AK, Lindsay MD, Dowse GK, Beers MY. Murray Valley encephalitis in Western Australia in 2000, with evidence of southerly spread. Commun Dis Intell 2000;24:368-372.
Smith DW, Broom AK, Wallace MJ. Prevalence of antibody to Murray Valley encephalitis virus in Aboriginal communities in the Kimberley region of Western Australia in 1995. Arbovirus Research in Australia 1997;7:65.
Chin J (editor). Control of Communicable Diseases Manual 17th Edition American Public Health Association, Washington 2000.
Broom A, Lindsay MD, Johansen CA, Wright AE, Mackenzie JS. Two possible mechanisms for survival and initiation of Murray Valley encephalitis virus activity in the Kimberley region of Western Australia. Am J Trop Med Hyg 1995;53:95-99.
Doherty RL, Carley JG, Kay BH, Filippich C, Marks EN. Murray Valley encephalitis virus infection in mosquitoes and domestic fowls in Queensland, 1974. Aust J Exp Biol Med Sci 1976; 54:237-43.
Marshall ID, Brown BK, Keith K, Gard GP, Thibos E. Variation in arbovirus infection rates in species of birds sampled in a serological survey during an encephalitis epidemic in the Murray Valley of south-eastern Australia, February 1974. Aust J Exp Biol Med Sci 1982;60:471-8.
Boyle DB, Dickerman RW, Marshall ID. Primary viraemia responses of herons to experimental infection with Murray Valley encephalitis, Kunjin and Japanese encephalitis viruses. Aust J Exp Biol Med Sci 1983;61:655-64.
Kay BH, Young PL, Hall RA, Fanning ID. Experimental infection with Murray Valley encephalitis virus. Pigs, cattle, sheep, dogs, rabbits, macropods and chickens. Aust J Exp Biol Med Sci 1985;63:109-26.
Lindsay M, Mackenzie J. Vector-borne viral diseases and climate change in the Australian region: major concerns and the public health response. Climate change and human health in the Asia Pacific Region. Curson P, Guest C, Jackson E, eds. Australian Medical Association and Greenpeace International, Canberra, 1997 pp 47-62.
Mackenzie JS, Lindsay MD, Broom AK. Climate changes and vector-borne diseases: potential consequences for human health. Health in the Greenhouse. The medical and environ mental health effects of global climate change. Ewan CE, Bryant EA, Calvert GD, Garrick JA, (eds.) Australian Government Publishing Service, Canberra, 1993 pp 229-234.
Mackenzie JS, Hall RA, Lindsay MD, Bielefeldt-ohmann H, Poidinger MS. Molecular epidemiology and phylogeny of Australian arboviruses. Molecular Epidemiology of Infectious Disease. Ed. Thompson RCA. Arnold Press, London 2000
Mackenzie JS, Coelen RJ, Sellner L, Broom AK, Lindsay MD, Hall RH, et al. Surveillance of mosquito-borne viral diseases: a brief overview and experiences in Western Australia. Rapid methods and automation in microbiology and immunology. Spencer RC, Wright EP, Newsom SWB, eds. Intercept Ltd. Andover, UK,1994; pp.191-203.
Mackenzie JS, Broom AK, Aldred J, Hueston L, Cunningham AL. Australian encephalitis: sentinel chicken surveillance programme. Commun Dis Intell 1992;16:55-57.
Nicholls, N. A method for predicting Murray Valley encephalitis in south-east Australia using the Southern Oscillation. Aust J Exp Biol Med Sci 1986;64:587-594.Top of page
Kay BH, Saul AJ, McCullagh A. A mathematical model for the rural amplification of Murray Valley encephalitis virus in southern Australia. Am J Epidemiol 1987;125:690-705.
Broom A, Sturrock K, van Heuzen B, Lindsay M, Smith D. Seroconversions in sentinel chickens provide an early warning of Murray Valley encephalitis virus activity in Western Australia. 2001 in press. Arbovirus Research in Australia Vol 8.
McMinn PC, Carman PG, Smith DW. Early diagnosis of Murray Valley encephalitis by reverse transcriptase-polymerase chain reaction. Pathology 2000;32:49-51.
Mackenzie JS, Broom AK, Calisher CH, Cloonan MJ, Cunningham AL, Gibson C, et al. Diagnosis and reporting of arboviral infections in Australia. Commun Dis Intell 1993;17: 202-206.
Public Health Laboratory Network. Public Health Laboratory Network Summary Laboratory Case Definitions. 2001; Department of Health and Aged Care (available on request by e-mail: phln@health.gov.au).
Merritt A, Phillips D, Carney I, Whelan P. A presumptive case of fatal Murray Valley encephalitis acquired in Alice Springs. Commun Dis Intell 1998;22:103-104.
Lindsay M, Broom AK, Oliveira N, Jasinska E, van Heuzen B, Caulfield S, et al. Western Australian Arbovirus Surveillance and Research Program annual report. 1997-1998.
Newland J, Phillips D, Wiemers M, Pearce M. Murray Valley encephalitis virus infections in Queensland. Commun Dis Intell 1991;15:447-448.
Hanna J, Blackwell N, Phillips D, Broom A, Mackenzie J, Smith D. Murray Valley encephalitis in north-west Queensland: a case report and evidence of further transmission. Commun Dis Intell 1994;18:402-403.
National Health and Medical Research Council Public Health Committee. Surveillance case definitions. 1994; Commonwealth Department of Health and Aged Care. Available at http://www.nhmrc.gov.au/publications/synopses/cd8syn.htm
Doherty RL. Surveys of haemagglutination-inhibiting antibody to arboviruses in Aborigines and other population groups in northern and eastern Australia, 1966-1971. Transactions of the Royal Society of Tropical Medicine and Hygiene. 1973;67: 197-205.
Doherty RL, Carley JG, Filippich C, White J, Gust ID. Murray Valley encephalitis in Australia, 1974: Antibody responses in cases and community. Aust NZ J Med 1976;6:446-453.
Hawkes R, Pamplin AJ, Boughton CR, Naim HM. Arbovirus infections of humans in high-risk areas of south-eastern Australia: a continuing study. Med J Aust 1993;159:159-162.
Doherty RL, Filippich C, Carley JG, Hancock YE. Antibody to togaviruses in the Northern Territory and adjoining areas of Australia. Aust J Exp Biol Med Sci 1977;55:131-9.
Holland J, Smith DW, Broom AK, Currie B. A comparison of seroprevalence of arboviral infections between three Northern Territory regions. Australian Microbiologist 1994;15:A105.
Broom AK, Lindsay MD, Wright AE, Mackenzie JS. Arbovirus activity in a remote community in the south-east Kimberley. Arbovirus Research in Australia-Proceedings 6th Symposium 1993;262-266.
Dale PER, Ritchie SA, Territo BM, Morris CD, Muhar A, Kay BH. An overview of remote sensing and GIS for surveillance of mosquito vector habitats and risk assessment. J Vector Ecol 1998;23:54-61.
Dale PE, Hapgood G, Kay B, Morris C, Standfast H (editors). Australian Mosquito Control Manual. Australian Mosquito Control Association Inc. Redland Bay 1998.
NSW Health. New South Wales Arbovirus Disease Control Strategy. December 1998.
Department of Human Services, Victoria. Australian Arboencephalitis Contingency Plan. December 2000.
Fine A, Layton M. Lessons from the West Nile viral encephalitis outbreak in New York City, 1999: Implications for bioterrorism preparedness. Clin Infect Dis 2001;32:277-82.
Centers for Disease Control. Guidelines for evaluating surveillance systems MMWR 1988;37:1-17.
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