Dynamics and Protective Effectiveness of Serological Testing Among Healthcare Workers Vaccinated Against COVID-19. - Gurkšnienė V; Alčauskas T; Karosienė D; Urbonienė J; Majauskaitė F; Paulauskas M; Zablockienė B; Vitkus D; Jančorienė L (Medicina (Kaunas, Lithuania), 2026)