Associations between epidemiological and laboratory parameters and disease severity in hospitalized patients with COVID-19 during first and second epidemic waves in middle south Mato Grosso.

BACKGROUND: COVID-19 is a multisystemic disease characterized by respiratory distress. Disease severity is associated with several factors. Here we characterize virological findings and evaluate the association of laboratorial, epidemiological, virological findings and clinical outcomes of 251 patients during the first and second epidemic waves of COVID-19. METHODS: This transversal study used biological samples and data from patients hospitalized with COVID-19 between May 2020 and August 2021 in the metropolitan region of Cuiabá, Mato Grosso Brazil. Biological samples were subjected to RT-qPCR and MinION sequencing. Univariate and multivariate logistic regression and Odds ratio were used to correlate clinical, laboratorial, epidemiological data. FINDINGS: Patients were represented by males (61.7%) with mean age of 52.4 years, mild to moderate disease (49,0%), overweight/obese (69.3%), with comorbidities (66.1%) and evolving to death (55.38%). Severe cases showing symptoms for prolonged time, ≥ 25% of ground-glass opacities in the lungs and fatality rate increased significantly in second wave. Fatality was statistically associated to > 61 years of age,>25% ground-glass opacities in the lungs, immune, cardiac, or metabolic comorbidities. Higher viral load (p < 0.01/p = 0.02 in each wave), decreased erythrocyte (p < 0.01), hemoglobin (p < 0.05/p < 0.01), hematocrit (p < 0.01), RDW (p < 0.01), lymphocyte (p < 0.01), increased leucocyte (p < 0.01), neutrophil (p < 0.01) and CRP levels (p < 0.01) showed significant association with fatality in both waves, as did Neutrophil/Platelet (NPR; p < 0.01), Neutrophil/Lymphocyte (NLR; p < 0.01) and Monocyte/Lymphocyte ratio (MLR; p < 0.01). SARS-CoV-2 genomes from lineage B.1.1.33(n = 8) and Gamma/P.1(n = 15) shared 6/7 and 20/23 lineage-defining mutations, respectively. MAIN CONCLUSIONS: Severity and mortality of COVID-19 associated with a panel of epidemiological and laboratorial findings, being second wave, caused by Gamma variant, more severe in this in-hospital population.

Sialovirome of Brazilian tropical anophelines.

Anophelinae is a widely dispersed Culicidae subfamily that may carry a unique virome. Here we herein report the set of viruses found in 323 salivary glands of 16 anopheline species sampled at Upper Pantanal, Chapada dos Guimarães National Park and Coxipó river basin, South Central Mato Grosso, Brazil, pooled (n = 11) and subjected to high throughput sequencing. Metagenomics revealed the presence of nine viral sequences belonging to novel viruses from seven viral families: Purunga is a putative novel orbivirus sharing 74% and 65% aa identity, respectively, with the VP1 and VP3 segments of Changuinola serogroup, Jaracatiá flavivirus shares 60% amino-acid (aa) identity with Aedes flavivirus. Coxipó dielmovirus and Chapada dielmovirus shared 51% and 39% aa identity with Merida virus. Coloiado-orthomyxo like virus is 57.1-64.8% identical at aa level to Aedes albonnulatus orthomyxo-like virus. Mujica picorna-like virus shares 49% aa identity with Flen picorna-like virus and Chiquitos virus is 50% similar to Ista virus, both from Picornavirales order. Cerrado partiti-like-virus shares 75-86% aa identity with Atrato partiti-like virus 2. We also found the S and L segments of Anopheles triannulatus orthophasmavirus (92% identity) in Anopheles lutzi from Chapada dos Guimarães. The identification of these putative novel viruses underscore the wide dispersion of viruses in culicid hosts contributing to extensions on mosquito virome descriptions.