Molecular survey of flaviviruses and orthobunyaviruses in Amblyomma spp. ticks collected in Minas Gerais, Brazil / Investigação molecular de flavivírus e orthobunyaviruses em carrapatos do gênero Amblyomma spp. coletados em Minas Gerais, Brasil

Abstract Due to anthropic environmental changes, vector-borne diseases are emerging worldwide. Ticks are known vectors of several pathogens of concern among humans and animals. In recent decades, several examples of tick-borne emerging viral diseases have been reported (Crimean Congo hemorrhagic fever virus, Powassan virus, encephalitis virus, heartland virus, severe fever with thrombocytopenia syndrome virus). Unfortunately, few studies addressing the presence of viruses in wild ticks have been carried out in South America. With the aim of detecting flaviviruses and orthobunyaviruses in ticks, we carried out molecular detection in wild ticks collected in the state of Minas Gerais, Brazil. No Flavivirus-positive ticks were detected; however, we detected activity of Orthobunyavirus in 8 Amblyomma tick specimens. One of those individuals was positive for Bunyamwera orthobunyavirus, which represents the first report of this virus among ticks in South America. Further studies related to the ecology of zoonotic diseases are needed to increase knowledge of this topic, including attempts at viral isolation, full genome sequencing and biological characterization. In this way, we will obtain a better picture of the real risk of ticks as a vector for viral diseases for humans and animals on our continent, where no tick-borne viral disease is known to occur.

Resumo Alterações ambientais causadas pelo homem têm levado à emergência de doenças transmitidas por vetores no mundo. Carrapatos são vetores conhecidos de vários patógenos de importância médica e veterinária, tendo sido reportado nas últimas décadas um grande número de enfermidades virais emergentes transmitidas por eles (vírus da Febre Hemorrágica da Crimeia-Congo, vírus Powassan, vírus da Encefalite, vírus Heartland e vírus da Síndrome da Febre Trombocitopênica Severa). Infelizmente, poucos estudos envolvendo a pesquisa de vírus em carrapatos foram conduzidos na América do Sul até o momento, e nas últimas décadas um elevado número de enfermidades virais emergentes transmitidas por estes artrópodes foi relatado. Com o objetivo de investigar a presença de flavivírus e orthobunyavírus em carrapatos, foi conduzida uma análise molecular em espécimes coletados no estado de Minas Gerais, Brasil. Em nenhum carrapato foi detectada a presença de Flavivirus, no entanto, em 8 espécimes do gênero Amblyomma, foi detectada a presença de Orthobunyavirus, dos quais um espécime foi positivo para Bunyamwera orthobunyavirus. Novos estudos relacionados à ecologia de doenças zoonóticas, incluindo tentativas de isolamento viral, sequenciamento completo do genoma e caracterização biológica, são necessários. Desta forma, será possível ter uma base sobre os riscos da transmissão de vírus patogênicos por carrapatos em nosso continente, uma vez que até agora isso é desconhecido.

Características clínicas y para clínicas de los pacientes con fiebre manchada por Ricketts ia ricketts ii en Panamá (1950­-1951; 2004­-2017) / Clinical and para clinical characteristics of patients with fevers potted by Rickettsiarickettsii in Panama (1950­1951; 2004­2017)

La fiebre manchada causada por Ric ketts ia ric ketts iies por mucho la enfermedad transmitida por garrapatas más importante en América Latina y una de las zoonosis más relevante del continente. En Panamá esto es notorio si se considera que los casos confirmados de la misma se han registra­ do en dos series: 1950­1951, donde se presentaron cinco casos, donde los dos primeros fueron re­ sultaron fatales, y de 2004­2017, donde se confirmaron 10 casos, con nueve fallecimientos. A pes ar de lo anterior, la fiebre manchada causada por Rrickettsii es una enfermedad de baja preva­lencia y está dentro de las enfermedades desatendidas. El diagnóstico oportuno de Rrickettsii en personas afectadas por la misma, incrementa la posibilidad de sobrevivencia del paciente; sin em­bargo, a pesar de su alto porcentaje de mortalidad, esta enfermedad es poco reconocida y no se cuenta con sospecha clínica. Con el objetivo de presentar sus características clínicas en Panamá, se analizan individualmente cada reportes de caso, incluyendo datos etarios , de localidad, sínto­mas descritos, análisis aplicados y tratamiento.

The spotted fever caused by Ric ketts ia rickettsii is by far the most important tick­borne disease in Latin America and one of the most important zoonoses in the continent. In Panama this is notorious if it is considers that the confirmed cases have been registered in two series: 1950­1951, with five cas es and two fatal; and 2004­2017, with 10 cases and nine deaths. Despite the above, spotted fe­ver caused by R. rickettsii is a disease of low prevalence and is among the neglected diseases. The timely diagnosis of Rrickettsii in people affected by it, increases the possibility of survival of the pa­tient; however, despite its high mortality rate, this disease is poorly recognized and there is no clini­ cal suspicion. In order to present their clinical characteristics in Panama, each reports of case is analyzed individually, including age, location, symptoms described, applied analysis and treatmen

Severe Fever with Thrombocytopenia Syndrome: Tick-Mediated Viral Disease

No abstract available.

Prevalence of tick-borne encephalitis virus in ticks from southern Korea

The prevalence of tick-borne encephalitis virus (TBEV) in southern Korea was determined by collecting ticks using tick drags. A total of 4,077 of 6,788 ticks collected were pooled (649 pools) according to collection site, species, and developmental stage and assayed for TBEV. The TBEV protein E and NS5 gene fragments were detected using RT-nested PCR in six pools of nymphs collected from Jeju Island (2,491 ticks). The minimum field detection rates for TBEV were 0.17% and 0.14% for Haemaphysalis longicornis and Haemayphysalis. flava nymphs, respectively. The 252 bp NS5 and 477 bp protein E gene amplicons were sequenced. Phylogenetic analysis showed that the NS5 and protein E genes of the Jeju strain were clustered with Western subtype (98.0% and 99.4% identity, respectively). The Western subtype of TBEV is endemic in Korea, including Jeju Island. The study of vector and zoonotic host susceptibility to TBEV is required to better understand its potential impact on public health.