Iinfluenza and ARI intensity in Bulgaria  was increased during week No 41 (05.10.2015-11.10.2015).   The total incidence  per 10,000 population was 53.86(during week No 40 the incidence was 38.77). From a total of 384 347 persons under surveillance, belonging to all age groups, a total of 2070 ARI cases have been reported (during week No 40 the cases were 1490). The incidence was highest in the age group 0-4 yrs (231.41 per 10,000 population), followed by age group of 5-14 yrs (165.01 per 10,000).