When you gram stain it the cells are intensely purple

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(When you Gram stain it, the cells are intensely purple.) Found in many places throughout the environment human skin, animals, water, dust, and soil. M. luteus on human skin transforms chemicals in sweat into body odor . Grow well even with little water or high salt concentrations. (You may find it growing on your Mannitol Salt nasal sample.) Normal flora that can become opportunistic in immune compromised. Bacterial Genus : _______________ This is your lab friend Micrococcus luteus . Images: M. luteus colonies, T.Port; M. luteus, Janice Carr, PHIL #9761 From the Virtual Microbiology Classroom on ScienceProfOnline.com
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GRAM-POSITIVE, Facultative anaerobe, coccus-shaped Diverse genus, some normal flora, some pathogens that produce toxins . Pairs or chains of cocci. Classified by hemolysis pattern on blood agar ; alpha, beta and gamma hemolysis. Beta-hemolytic Strep fall into two groups: - Group A streptococci (S. pyogenes) cause diseases including strep throat, necrotizing fasciitis (flesh-eating disease), scarlet fever, postpartum fever, and streptococcal toxic shock syndrome. - Group B streptococci (S. agalacitiae; say a-ga-LAC-tea-ae ) can cause life-threatening pneumonia and meningitis in newborns the elderly and adults with compromised immune systems. Group B strep infections are different from other strep infections. Individual can be colonized by the bacteria before any symptoms are obvious. Women screened for GBS during pregnancy. About 10-30 percent carry GBS in vagina or surrounding area. Usually harmless in healthy adults, but may cause stillbirth and serious infections in babies. Group A and B distinguished based on antigens (specific chemicals that our immune system reacts to) in their cell walls. Streptococcus spp . Images: Hemolysis patterns on Blood Agar, T. Port; Streptococcus bacteria Public Health Image Library 900x,, #2110. Bacterial Genus : _____________ Blood Agar From the Virtual Microbiology Classroom on ScienceProfOnline.com
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GRAM-POSITIVE Facultative anaerobe coccus-shaped Coccus-shaped bacteria, which divides in a way that results in grape-like clusters. - Staphylococcus aureus (golden staph), most common cause of staph infections. - Approximately 20–30% of general population “Staph carriers." - S. aureus can cause illnesses ranging from minor skin infections to life-threatening diseases, such as meningitis, Toxic shock syndrome (TSS) & septicemia. - MRSA = M ethicillin- r esistant S taphylococcus a ureus - One of the four most common causes of nosocomial infections , often causing postsurgical wound infections. - S. epidermidis is normal flora which inhabits the skin of healthy humans. Image: Mannitol salt plates, T. Port; S. aureus, Janice Haney Carr , PHIL #10046; Gram stain Staph, T. Port Mannitol Salt Bacterial Genus : ____________ Our lab friend Stapylococcus epidermidis . Staphylococcus aureus, Golden staph (One of the reasons snot gets yellow when you are sick.) Gram Stain From the Virtual Microbiology Classroom on ScienceProfOnline.com
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GRAM- v a r i a b l e, obligate aerobe , bacillus-shaped Q: Why?
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