PPT-Streptococci & Corynebacteria

Streptococci Cocci spherical Morphology Gram positive cocci in chains Characteristics of Streptococci Morphologygtgt Gram positive cocci Arranged in chains and some spp arranged in pairs. Dr. Nariman Sindi. 1. classification. The classification of streptococci is based on:. Hemolysis:. Alpha-. hemolytic. streptococci (. α. -. hemolytic. ):. Incomplete lysis (partial hemolysis) of red blood cells (RBCs) in the agar resulting in the formation of a greenish zone around their colonies.. بسم الله الرحمن الرحيم. Diagnostic Medical Microbiology-Laboratory Manual. Culture. . Throat. A throat swab culture is a laboratory test done to isolate and identify organisms that may cause infection in the throat mainly . Basmah . almaarik. . Lab # 6. Streptococci. All are Gram Positive . Cocci. arranged in chains (short or long). All are . Catalase. -. ve. + . ve. - . ve. Gram Stain. Staphylococci. Streptococci. Culture. STREPTOCOCCUS 15.1INTRODUCTIONStreptococci Streptococci are Gram-positive cocci arranged in chains or pairs. They are part ofStreptococcus pyogenes causing pyogenic After reading this lesson, you will Cocci. . Streptococci. . By . Lec. . Dr. . Thanaa. . Rasheed. . Abdulrahman. 6. th. lect. bacteriology. Streptococci of medical importance are listed in Table 1. Species. Lancefield Group. Corynebacteria. . Streptococci. Cocci. :. spherical. Morphology:. Gram positive, . cocci. in chains . Characteristics of Streptococci. Morphology>> . Gram positive, . cocci. Arranged in chains, and some spp. arranged in pairs. Associate . Professor Microbiology. Department of Pathology. Introduction. One of the two main human pathogens.. Gram positive . cocci. .. Oval shaped.. Arranged in chains and pairs.. Catalase negative.. . objectives. * Study systemic bacteriology. * Describe Genus Streptococcus, its types, pathogenesis, and lab diagnosis. . When grown on sheep blood agar, streptococci display . one. of . three types . Zainab. Abdul . jabar. . Aldhaher. Streptococcus. is a . genus. of . spherical. . Gram-positive. . bacteria. belonging to the . phylum. . Firmicutes. ]. and the . lactic acid bacteria. group. . McCormick DW, Molyneux EM. Bacterial Meningitis and Haemophilus influenzae Type b Conjugate Vaccine, Malawi. Emerg Infect Dis. 2011;17(4):688-690. https://doi.org/10.3201/eid1704.101045. . Greek-. streptus. =flexible: . coccus. = sphere spherical or ovoid cells, occurring in short or long chins, pairs, not in groups. Capsules are not regularly . formid. but develop in some species. . . Hazim. . abdul. . Wahhab. General characters of streptococci. :. Spherical . (cocci) arranged in chain . or pairs. .. Gram- positive.. Most . streptococci are facultative anaerobes.. All . Streptococci are catalase negative.. Normal flora . Also called “indigenous . microbiota. ”. Diverse group of microbial population that every human being . harbors. on his/her skin and mucous membranes. ™. Sites. - gastrointestinal tract (GIT), respiratory tract, genitourinary tract & skin. By: Nader . Alaridah. MD, PhD. STREPTOCOCCUS. The “other” Gram positive Coccus. Some are members of the normal human microbiota; others are associated with important human diseases attributable to the direct effects of infection by streptococci or in other cases to an immunologic response to them.