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Fatal human infection with rabies-related Duvenhage virus, South Africa.

Duvenhage virus was isolated from a patient who died of a rabieslike disease after being scratched by a bat early in 2006. This occurred [approximately equal to] 80 km from the site where the only other known human infection with the virus had occurred 36 years earlier.

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The genus Lyssavirus within the family Rhabdoviridae currently includes rabies virus (RABV) (genotype 1) and 6 rabies-related viruses: 3 from Africa, Lagos bat virus (LBV) (genotype 2), Mokola virus (MOKV) (genotype 3), and Duvenhage virus (DUVV) (genotype 4); European bat lyssaviruses 1 and 2 (EBEV1 and 2) (genotypes 5 and 6); and Australian bat lyssavirus (ABEV) (genotype 7) (1). Strains of RABV (genotype 1) undergo genetic adaptation to particular animal hosts so that within specific areas the disease is manifested and transmitted predominantly by 1 host species. The canid, or dog, biotype of RABV is the most widely distributed in the world. In South Africa, RABV is transmitted by dogs and jackals in the northern region of the country, by dogs in the eastern region where most cases of human rabies occur, and by bat-eared foxes in the western region. In addition, an indigenous herpestid biotype of RABV (genotype 1) is transmitted by mongooses (Herpestidae) on the interior plateau of South Africa. This biotype does not spread readily to dogs but causes occasional cases of rabies in dogs, cats, humans, and more frequently, cattle and sheep (2).

RABV (genotype 1) has never been isolated from bats outside North and South America, but rabies-related viruses have been isolated from bats elsewhere. In Africa, LBV and DUVV are associated with bats, but MOKV is uniquely associated with shrews and rodents, not bats. Fifteen isolations of LBV have been reported, including 8 from fruit bats and a cat in KwaZulu-Natal Province of South Africa, but the virus has never been associated with human disease (2,3). MOKV has been isolated from shrews, rodents, cats, and a dog in Africa and from 7 cats with rabies-like disease in KwaZulu-Natal and Eastern Cape provinces of South Africa (2). The virus is believed to have caused rabieslike disease in 2 persons in Nigeria in 1969 and 1971, shortly after its initial discovery in shrews in 1968, but no cases of human infection have subsequently been recognized (4,5). DUVV was discovered in 1970 when it caused fatal rabieslike disease in a person bitten by an unidentified insectivorous bat [approximately equal to] 150 km northwest of Johannesburg, South Africa (6). In 1981, the virus was isolated from what is believed to have been a Miniopterus schreibersi insectivorous bat caught in daylight by a cat in Makhado town (formerly Louis Trichardt) in Limpopo Province, South Africa, and in 1986 the virus was recovered from an insectivorous bat, Nycteris the baica, trapped in a survey in Zimbabwe (7,8).

The Study

DUVV infection was recently confirmed in a 77-year-old man with type 2 diabetes who was scratched on the face by what appears to have been an insectivorous bat in February 2006 in North West Province, South Africa, [approximately equal to] 80 km from the location where the first DUVV infection occurred 36 years earlier. The bat flew into a room at night, landed on the man's spectacles while he was attempting to chase it out, and scratched his face as he brushed it off. The bat did not appear to have bitten him, and it escaped after the incident. He did not seek medical care, and thus no postexposure treatment was given. He became ill at home in Cape Town 27 days later and received treatment for influenzalike illness. He slept most of the following day, had hallucinations that night, and was admitted to a hospital on the third day of illness. On admission, he had a fever (40[degrees]C), tachycardia, neck and general limb rigidity, hyper-reflexia, facial fasciculation, and involuntary grimacing. Within 24 hours generalized tonic-clonic seizures had developed with status epilepticus supervening. These necessitated intubation, sedation, and mechanical ventilation. He died on day 14 of his illness.

Heminested reverse transcription--PCR was performed as previously described (9) with modified forward primer JWl2 (10). This procedure detected lyssavirus nucleic acid in saliva taken on day 10 of illness and in brain tissue collected postmortem. Nucleotide sequencing of the PCR products and phylogenetic analysis performed as previously described (11) confirmed the identity of the agent as DUVV (Figure), and live virus was isolated from saliva and brain tissue by mouse inoculation. Immunofluorescence tests with antirabies conjugate prepared to be cross-reactive with the African rabies related viruses (Onderstepoort Veterinary Institute, Pretoria, South Africa) showed small and sparse inclusion bodies in impression smears of the cortex, hippocampus, thalamus, medulla, and cerebellum. Histopathologic examination of sections from the cortex, hippocampus, thalamus, hypothalamus, midbrain, pons, medulla, and cerebellum showed polioencephalitis affecting predominantly the diencephalon and brainstem and involving varying degrees of neuronopathy, neuronal loss, astrocytosis, parenchymal and perivascular lymphocytic infiltration with CD45 immunopositivity, sparse macrophage activation, and axonal spheroid formation. No nuclear or cytoplasmic inclusions were observed.

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Conclusions

The ability to distinguish between various lyssaviruses and monitor their relative distribution and prevalence has important implications for implementation of control measures. It was recognized in 1932 that mongoose-associated rabies in South Africa differs from classic dog rabies (2). Although an inadequately characterized lyssavirus was isolated from a bat trapped in a survey in 1963, before the existence of rabies-related viruses was known, awareness of lyssaviruses other than rabies viruses dates from the identification of DUVV in 1970 and was followed by detection of LBV and MOKV in South Africa (6,7,12). Routine differentiation of diagnostic isolates became feasible with the availability of monoclonal antibodies during the 1980s and the subsequent introduction of molecular epidemiology techniques (7,13-15). Although instances of persons seeking rabies prophylaxis after exposure to bats have been reported, the recent case of DUVV infection constitutes only the second known instance of a person in South Africa with lyssavirus infection after such an encounter. Nevertheless, it is clear that rabies-related viruses are widely endemic in South Africa and that active investigation of the bat-associated lyssaviruses is warranted.

Dr Paweska is head of the Special Pathogens Unit, National Institute for Communicable Diseases, South Africa. His research interests include viral hemorrhagic fevers, rabies, and rabiesrelated viruses.

References

(1.) Fauquet CM, Mayo MA, Maniloff J, Desselberger U, Ball LA. Virus taxonomy: the classification and nomenclature of viruses. The eighth report of the International Committee on Taxonomy of Viruses. San Diego: Academic Press: 2004. p. 623-31.

(2.) Swanepoel R. Rabies. In: Coetzer JAW, Tustin RC, editors. Infectious diseases of livestock. 2nd ed. Cape Town (South Africa): Oxford University Press: 2004. p. 1123-82.

(3.) Markotter W, Randles J, Rupprecht CE, Sabeta CT. Wandeler AI, Taylor PJ, et al. Recent kagos bat virus isolations from bats (suborder Megachiroptera) in South Africa. Emerg Infect Dis. 2006:12:504-6.

(4.) Familusi JB, Moore DL. Isolation of a rabies related virus from the cerebrospinal fluid of a child with 'aseptic meningitis.' Afr J Med Sci. 1972;3:93-6.

(5.) Familusi JB, Osunkoya BO, Moore DL, Kemp GE, Fabiyi A. A fatal human infection with Mokola virus. Am J Trop Med Hyg. 1972;21:959-63.

(6.) Tignor GH, Murphy FA, Clark HF, Shope RE, Madore P, Bauer SP, et al. Duvenhage virus: morphological, biochemical, histopathological and antigenic relationships to the rabies serogroup. J Gen Virol. 1977:37:595-611.

(7.) Schneider LG, Barnard BJH, Schneider HR Application of monoclonal antibodies for epidemiological investigations and oral vaccination studies: I. African virus. In: Kuwert E, Merieux C, Koprowski H, Bogel K, editors. Rabies in the tropics. Berlin: Springer-Verlag; 1985. p. 47-59.

(8.) Foggin CM. Rabies and rabies-related viruses in Zimbabwe: historical, virological and ecological aspects. [Doctoral dissertation]. Harare (Zimbabwe): University of Zimbabwe; 1988.

(9.) Whitby JE. Heaton PR, Whitby HE, O'Sullivan E, Johnstone R Rapid detection of rabies and rabies-related viruses by RT-PCR and enzyme-linked immunosorbent assay. J Virol Methods. 1997:69:63-72.

(10.) Black EM, McElhinney LM, Lowings JP, Smith J, Johnstone P, Heaton PR. Molecular methods to distinguish between classical and the rabies-related European bat lyssaviruses. J Virol Methods. 2000;87:123-31.

(11.) Venter M, Smit S, Leman P. Swanepoel R. Phylogenetic evidence of widespread distribution of genotype 3 JC virus in Africa and identification of a type 7 isolate in an AIDS patient. J Gen Virol. 2004;85:2215-9.

(12.) Mansvelt PR. The role of wild life in the epizootiology of some infectious and parasitic animal diseases in South Africa. Bull Off Int Epizoot. 1965;64:825-35.

(13.) Smith JS, Yager PA, Orciari LA. Rabies in wild and domestic carnivores of Africa: epidemiological and historical associations determined by limited sequence analysis. Onderstepoort J Vet Res. 1993;60:307-14.

(14.) Nel Lit, Bingham J, Jacobs JA, Jaftha JB. A nucleotide-specific polymerase chain reaction assay to differentiate rabies virus biotypes in South Africa. Onderstepoort J Vet Res. 1998;65:297-303.

(15.) Nel L, Jacobs JA, Jaftha JB, von Teichman BF, Bingham J. New cases of Mokola virus infection in South Africa: a genotypic comparison of southern African isolates. Virus Genes. 2000;20:103-6.

Janusz T. Paweska, * Lucille H. Blumberg,* Charl Liebenberg, ([dagger]) Richard H. Hewlett, ([double dagger]) Antoinette A. Grobbelaar, * Patricia A. Leman, * Janice E. Croft, * Louis H. Nel, ([section]) Louise Nutt, ([double dagger]) and Robert Swanepoel *

* National Institute for Communicable Diseases, Sandringham, South Africa; ([dagger]) Durbanville Mediclinic, Cape Town, South Africa; ([double dagger]) University of Stellenbosch, Tygerberg, South Africa; and ([section]) University of Pretoria, Pretoria, South Africa

Address for correspondence: Robert Swanepoel, National Institute for Communicable Diseases, Private Bag X4, Sandringham 2131, South Africa; email: bobs@nicd.ac.za
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Title Annotation:DISPATCHES
Author:Swanepoel, Robert
Publication:Emerging Infectious Diseases
Geographic Code:6SOUT
Date:Dec 1, 2006
Words:1597
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