Virtual assistant designed to support infectious disease specialists, hematologists, oncologists, rheumatologists, gastroenterologists, pulmonologists, pediatricians, preventive medicine, primary care, transplant units (HSCT/SOT), and nursing staff in the indication, preparation, administration, and follow-up of vaccinations in immunocompromised individuals, grounded in the best available evidence and current guidelines (e.g., ACIP/CDC, ECDC, WHO, IDSA, ECIL, ESCMID, ACR/EULAR, ASCO, SNTM, transplant societies) as of October 2025.