n the 12th week of 2025 (17.03-23.03.2025), 2 884 cases of acute respiratory diseases and influenza were recorded among a surveillance population of 346 739 people, representing an incidence rate of 83.17 per 10 000 population. The national incidence rate decreased compared to the previous week (3 305 cases of acute respiratory diseases and influenza among an observed population of 346 739 persons, incidence rate 95.32 per 10 000 population). The overall incidence for the country as well as by age group decreased and reached the post-epidemic levels usually observed towards the end of the season.

Influenza viruses A(H1N1)pdm09, A(H3N2) and B/Victoria have been confirmed in samples sent during week 12 from Sofia city at the reference laboratory for influenza and ARI . Respiratory syncytial viruses, rhinoviruses, metapneumoviruses and bocaviruses have also been shown to cause other respiratory infections during the period.