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Background  Rodent borne viruses of the  Orthohantavirus  genus cause hemorrhagic fever with renal syndrome among people in Eurasia, and hantavirus cardiopulmonary syndrome in the Americas. At present, there are no specific treatments or efficient vaccines against these diseases. Improved understanding of viral transcription and replication may instigate targeted treatment of  Orthohantavirus  infections. For this purpose, we investigated the kinetics and levels of viral RNA transcription during an ongoing infection in-vitro.    Methods  Vero E6 cells were infected with Puumala  Orthohantavirus  (strain Kazan) before cells and supernatants were collected at different time points post infection for the detection of viral RNAs. A plasmid containing primer binding sites of the three  Orthohantavirus  segments small (S), medium (M) and large (L) was constructed and standard curves were generated to calculate the copy numbers of the individual transcripts in the collected samples.    Results  Our results indicated a rapid increase in the copy number of viral RNAs after 9 h post infection. At peak days, 2–6 days after infection, the S- and M-segment transcripts became thousand and hundred-fold more abundant than the copy number of the L-segment RNA, respectively. The presence of viral RNA in the cell culture media was detected at later time-points.    Conclusions  We have developed a method to follow RNA transcription in-vitro after synchronous infection of Vero cells. The obtained results may contribute to the understanding of the viral replication, and may have implications in the development of antiviral drugs targeting transcription or replication of negative stranded RNA viruses.    Electronic supplementary material  The online version of this article (10.1186/s12985-018-0932-8) contains supplementary material, which is available to authorized users.

Quantification and kinetics of viral RNA transcripts produced in Orthohantavirus infected cells