Environmental quality is much correlated with animal welfare. Microbiological status of a chicken broiler house environment in Qena city, Upper Egypt was investigated for total aerobic bacteria, fungal count, total coliforms, Escherichia coli, fecal enterococci, Staphylococci and Pseudomonads. Bacterial and fungal cultures from poultry feed, water, Litter, and air were undertaken every week throughout the 7-wk fattening period. The results showed that the indoor microbial contamination were

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... rated and detected. It was revealed that microorganisms in air were detected at a mean value (log 10 cfu/m 3 ) of 4.17 for total aerobic bacteria; 1.86 for total coliforms; 0.89 for E. coli; 1.59 for fecal enterococci; 2.78 for Staphylococci; 2.16 for Pseudomonads; and 2.59 for yeast/mold. The predominant bacterial species include S. aureus, Pseudomonas aeruginosa; fecal enterococcus, E. coli meanwhile Aspergillus flavus, Aspergillus fumigatus, and Candida albicans were among the mostly encountered fungal species. The results indicated an increase in air microbial concentration correlated with growth and age of birds. Microbiological examination of samples from litter, feed and water revealed contamination with one or more of microbial groups or species investigated. The present study revealed the occurrence of microbial contamination in poultry environment and strict hygienic measures should be considered for bird health performance and human and surrounding environment as well.