Antibody levels following vaccination against SARS-CoV-2 during an 11-month follow-up.

Aims: The primary aim of our monitoring was to determine the duration of persistence of antibody levels following administration of the Comirnaty (Pfizer/BioNTech) mRNA vaccine. The second aim was to analyse the effect of selected factors on the level of antibodies.

Methods: The study cohort consisted of 250 employees of the Medirex JSC laboratories.

Vertical transmission of murine gammaherpesvirus 68 in mice.

The mouse infected with murine gammaherpesvirus 68 (MHV-68) is accepted animal model for investigation of pathogenesis, oncogenesis, immunology and molecular biology of gammaherpesviruses in their natural host. However, little is known about the host range, epidemiology and pathogenesis of this natural pathogen of free-living murid rodents. Therefore we addressed the question of transplacental transmission of MHV-68 from pregnant Balb/c mice chronically infected with the virus to their fetuses and shedding of the virus by breast milk from chronically infected mothers to their offspring.