[Results of investigation of ticks in Volga river delta (Astrakhan region, 2017) for Crimean-Congo hemorrhagic fever virus (Nairoviridae, Orthonairovirus, CCHFV) and other tick-borne arboviruses.]

INTRODUCTION

There are natural foci of Crimean-Congo hemorrhagic fever (CCHF) that vectored by Hyalomma marginatum ticks in Volga river delta (Astrakhan region, South of Russia). The circulation of Dhori virus (DHOV) (Thogotovirus: Orthomyxoviridae) has been also shown here. We hypothesized that other tick-borne arboviruses are also likely to circulate in the region. In particular, Bhanja virus (Phlebovirus: Phenuiviridae), Wad Medani virus (Orbivirus: Reoviridae), and Tamdy virus (Orthonairovirus: Nairoviridae), which were found to circulate in neighboring regions and are vectored by Haemaphysalis spp., Dermacenter spp., and Hyalomma spp. ticks.

OBJECTIVES

The aim of the study was to examine ixodid ticks in Volga river delta for the presence of CCHFV, DHOV, Bhanja virus, Wad Medani virus, and Tamdy virus.

MATERIAL AND METHODS

Ticks were collected in Volga river delta in 2017. We used molecular genetic methods for the detection and analysis of nucleic acids (PCR, sequencing, phylogenetic analysis).

RESULTS

We detect CCHFV and DHOV RNA in H. marginatum ticks. The rate of infected H. marginatum ticks was 1.98% for CCHFV and 0.4% for DHOV. The results of genetic analysis showed that found DHOV strains are almost identical (99-100% in the M gene) and forms a separate genetic lineage alongside of Batken virus from Central Asia. At the same time, Bhanja virus, Wad Medani virus, and Tamdy virus were not found in ticks, collected in this region.

CONCLUSIONS

DHOV is circulating in the natural foci of CCHF in the Volga river delta. The ratio of infection of H. marginatum with CCHFV and DHOV was determined for the first time.

[Surgical treatment and different preoperative preparation of patients with malignant tumors of hepatopancreatoduodenal zone]

Different tactical approaches present to optimize surgical treatment of patients with malignant tumors hepatopancreatoduodenal zone. This research based on diagnosis and results of treatment of tumors of this localization, which included 357 analyzed case histories of patients treated in the Chelyabinsk Regional Hospital from 2010 to 2014. During this study was considered the preoperative preparation of patients with malignant obstructive jaundice genesis, and was assessed its impact on the level of postoperative complications and mortality. Farther was found effectiveness of a two-stage surgical treatment of patients with obstructive jaundice malignant etiology for the reduction of postoperative mortality. The complication rate is significantly reduced radically operated patients with bilirubin level below 40 mmol/l, palliative - 80 mmol/l. Also were presented results of treatment of chronic pain.