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First detection of tick-borne encephalitis virus RNA in clinical specimens of acutely ill patients in Hungary.

Tick-borne encephalitis virus (TBEV) is one of the endemic flaviviruses in Hungary, which is responsible for human infections every year. Neurological involvement in the disease is characterized by meningitis, encephalitis or meningoencephalitis which can result in long-term neurological and neuropsychiatric sequelae. Microbiological diagnosis of acute cases is predominantly based on serological tests due to the limited duration of viremia and long incubation period, however, the application of molecular methods can also supplement the serological diagnosis and provides epidemiological data. The aim of this study was to determine how viral RNA could successfully be detected from different body fluids of serologically confirmed acute cases. Serum, whole blood, cerebrospinal fluid and urine samples of 18 patients from the total of the 19 serologically diagnosed cases were investigated by using the RT-PCR method. Two sera and one urine sample of three patients tested positive and the European subtype of TBEV could be identified. As far as we know this was the first time that TBEV RNA could be detected from human clinical samples in Hungary. Our finding highlights that the application of molecular methods besides serological tests can be a valuable tool in differential diagnosis especially in areas like Hungary, where two or more flaviviruses are co-circulating.

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