Influenza and ARI intensity in Bulgaria was low during week No 37 (13.09.2021 - 19.09.2021).  The total incidence per 10,000 population was 35,91 (during week No 36 the incidence was 27,95). From a total of 367 888 persons under surveillance, belonging to all age groups, a total of 1321 ARI cases have been reported (during week No 36 the cases were 1059). The incidence was highest in the age group 0-4 yrs (218,80 per 10,000 population), followed by age group of 5-14 yrs (77,01 per 10,000 population).