Detection of Oropouche virus segment S in patients and inCulex quinquefasciatus in the state of Mato Grosso, Brazil

This study aimed to investigate the circulation of Orthobunyavirus species in the state of Mato Grosso (MT) Brazil. During a dengue outbreak in 2011/2012, 529 serum samples were collected from patients with acute febrile illness with symptoms for up to five days and 387 pools of female Culex quinquefasciatuscaptured in 2013 were subjected to nested-reverse transcription-polymerase chain reaction for segment S of the Simbu serogroup followed by nucleotide sequencing and virus isolation in Vero cells. Patients (5/529; 0.9%) from Cuiabá (n = 3), Várzea Grande (n = 1) and Nova Mutum (n = 1) municipalities were positive for the S segment of Oropouche virus (OROV). Additionally, eight/387 Cx. quinquefasciatuspools were positive for the segment, with a minimum infection rate of 2.3. Phylogenetic analysis indicated that all the samples belong to the subgenotype Ia, presenting high homology with OROV strains obtained from humans and animals in the Brazilian Amazon. The present paper reports the first detection of an Orthobunyavirus, possibly OROV, in patients and in Cx. quinquefasciatus mosquitoes in MT. This finding reinforces the notion that arboviruses frequently reported in the Amazon Region circulate sporadically in MT during dengue outbreaks.

Curso Internacional Enfermedades Virales Emergentes / Internatinal Course Emerging Viral Diseases

Contiene el resumen de las siguientes exposiciones: 1. Conceptos de infecciones emergentes y reemergentes/Robert E. Shope; 2. Red de laboratorios y programa de enfermedades emergentes del Instituto Nacional de Salud/Carlos Carillo; 3. Dengue y dengue hemorrágico en las Américas/Gary G. Clark; 4. Situación del dengue en el Perú/Daniel Neyra; 5. Fiebre amarilla en el Perú y riesgo de urbanización/César Cabezas; 6. Epidemiología y emergencia de la fiebre de oropouche/Francisco Pinheiro; 7. Bunyavirus en la amazonía peruana/Robert Shope; 8. Encefalitis equina venezolana y fiebre mayaro/Francisco Pinheiro; 9. Hepatitis virales B y delta en el Perú/César Cabezas; 10. Enfermedades por arenaviurs en las Américas/Robert B. Tesh; 11. Emergencia de hantavirus en las Américas/Charles Fulhorst; 12. Emergencia de virus transmitidos por artrópodos y roedores en el Perú/Douglas M. Watts; 13. HTLV I y II en el Perú/Eduardo Gotuzzo; 14. Diagnóstico de laboratorio de infecciones por arbovirus y hepatitis/Robert E. Shope; 15. Aplicación de técnicas moleculares en la detección y diagnóstico de infección por arbovirus/Laura J. Chandler; 16. Bioseguridad y riesgos en la manipulación de virus en el laboratorio/Alan Barrett; 17. Investigaciones en brotes/Paul Alfaro; 18. Intervención en brotes de enfermedades emergentes: nuevas vacunas candidatas/Robert E. Shope; 19. Intervención en brotes de enfermedades emergentes: control vectorial/Gary C. Clark

Epidemia de febre do Oropouche em Serra Pelada, município de Curionópolis, Pará, 1994 / Fever epidemic of Oropouche virus in Serra Pelada, municipality of Curionópolis, Pará State, 1994

In the final of November 1994, an outbreak of a febrile disease was observed in the Serra Pelada gold mine (5 degrees 35'S: 49 degrees 30'W) in the Southeast region of Pará State. Twenty samples were collected and sent to the laboratory of Arbovirus of Instituto Evandro Chagas. The tests showed that the disease was caused by Oropouche virus (Bunyaviridae, Bunyavirus, Simbu serological group). Between 8-22 December 296 serum samples were taken (54 from febrile patients, 16 paired samples and 242 from contacts and convalescent patients) of the 73 familiar groups. From febrile patients, ten Oropouche virus strains were obtained. From paired serum, six seroconversions were obtained and 242 other Oropouche infections were diagnosed by HI and MAC ELISA. The clinical-picture of febrile disease accompanied by severe bedache, chills, myalgia, photophobia retrobulbar pain and malaise was observed. Involvement of central nervous system was not observed. Based on the serological data, we estimated that in the outbreak of Serra Pelada around 5,000 cases occurred corresponding to a prevalence of 83 per cent.

Primeiro registro de epidemias causadas pelo vírus Oropouche nos estados do Maranhäo e Goiás, Brasil / 1st register of an epidemic caused by Oropouche virus in the states of Maranhäo and Goiás, Brazil

Os autores descrevem a ocorrência de epidemias causadas pelo vírus Oropouche (Oro) nos Estados dpo Maranhäo (MA) e Goiás (GO) em 1988. 36 amostras de vírus foram obtidas a partir da inoculaçäo do sangue de 120 pacientes em camundongos recém nascidos. A doença foi caracterizada por febre, cefaléia, dores musculares, articulares, fotofobia, dor retro ocular, náuseas e tontura. 128 das 197 pessoas examinadas em Porto Franco, MA, tinham anticorpos inibidores da hemaglutinaçäo (IH) para o agente e, em 106 foram detectados anticorpos IGM por MACELISA. Todos os grupos etários foram infectados, embora a incidência tenha sido mais elevada entre aqueles com 10 a 19 anos de idade. Quanto ao sexo, a infecçäo ocorreu igualmente em ambos os sexos. Recorrência dos sintomas foi observada em 56% dos casos positivos estudados. A inoculaçäo em camundongos Swiss recém nascidos de 3.624 Culicoides paraensis (Ceratopogonidae) e 1.970 Culex (Culex) quinquefasciatus (Culicidae), coletados em Porto Francos-MA, resultou em um único isolamento do vírus ORO a partir dos Culicoides. Essa é a primeira descriçäo de casos confirmados de infecçäo pelo vírus Oropouche nos Estados do Maranhäo e Goiás, Brasil