Microorganisms are used to make products such as antibiotics, vaccines, steroids, alcohols and other solvents, vitamins, amino acids, and enzymes. Microorganisms can even leach valuable minerals from low- grade ores. Staphylococcus aureus able to protect themselves against radicals and oxidants by producing carotenoid pigments. A golden yellow pigment called staphyloxanthin which is a precursor of - carotene has antioxidant and free radical scavenging properties in both in vivo and in vitro models. The book consists of evaluating the antioxidant property of pigment staphyloxanthin produced by S. aureus isolated from bovine mastitis samples against CCl4 induced stress in albino mice . The inference drawn in the present study is based on morphological, antibiogram, biochemical parameters of staphylococcus aureus and oxidative stress parameters in albino mice. The book includes review of literature, introduction, materials and methods, observations, discussion, summary and conclusion and references"