112 Manel et al. Int. J. Biosci. 2014 RESEARCH PAPER OPEN ACCESS Assessment of the bacteriological contamination of the wastewaters in Annaba’s main discharges in North-Eastern Algeria Derradji Manel 1* , Souiki Lynda 2 , Berrebbah Houria 1 , Djebar Mohammed-Reda 1 1 Laboratory of Cellular Toxicology, BP.12-Annaba 2300, Algeria 2 Biology Department, 8th May University 1945, Guelma, 24000, Algeria Key words: Wastewaters, Annaba, bacteria, fecal contamination indicators, pollution. doi: http://dx.doi.org/10.12692/ijb/4.1.112-117 Article published on January 01, 2014 Abstract In order to study the spatiotemporal evolution of the bacteriological quality of the wastewaters from the city of Annaba (Eastern Algeria), samples were taken on a fortnight basis from March 2012 to February 2013 at the three main sites of discharge. The Results show that the concentrations of fecal indicators contamination during low flow periods are higher than those recorded in the rainy season at the three sites. Total coliforms are higher (1000x 10 3 germ/100ml) in the dry season than during the rainy season (2x10 3 germ/100 ml) in the first site, the number of fecal coliforms is higher in the dry season (40x10 2 germ/100ml) than during the rainy period (6x10 2 germ/100ml) in the second site and the number of fecal streptococci in the dry season is higher (30x10 2 germ/100ml), than in the rainy season (10 2 germ /100ml) in the third site. Hence, we can notice a phenomenon of dilution. Results display the presence of pathogen bacteria, such as salmonella and shigella. * Corresponding Author: Derradji Manel  manelderradji12@outlook.com International Journal of Biosciences | IJB | ISSN: 2220-6655 (Print) 2222-5234 (Online) http://www.innspub.net Vol. 4, No. 1, p. 112-117, 2014