Iinfluenza and ARI intensity in Bulgaria  was low during week No 21  (18.05.2015-24.05.2015).   The total incidence  per 10,000 population  decreased and was 43.01 (during week No 20 the incidence was 49.20). From a total of 384 354 persons under surveillance, belonging to all age groups, a total of 1653 ARI cases have been reported (during week No 20 the cases were 1891). The incidence was highest in the age group 0-4 yrs (204.98 per 10,000 population), followed by age group of 5-14 yrs (117.79 per 10,000).