Staphylococci and streptococci
Read the topic background here, then explore the labeled visual and structured learning explanations on this page.
Read explanation on this page ↓ See diagram ↓Staphylococcus — on-site reading
This reference extract addresses Staphylococcus, a related subject. It does not cover every part of Staphylococci and streptococci.. The article introduction is reproduced here, so you do not need to leave MedAtlas to read it. It may not match the latest official medical guidance.
Staphylococcus is a genus of Gram-positive, spherical bacteria in the family Staphylococcaceae. Cells occur singly, in pairs, tetrads, short chains, and characteristically in irregular, grape-like clusters. Most species are non-motile, non-spore-forming, and facultatively anaerobic.
The name derives from the Ancient Greek words σταφυλή (staphylē), meaning “bunch of grapes”, and κόκκος (kokkos), meaning “berry” or “grain”, referring to the characteristic cellular arrangement. Alexander Ogston first described clustered cocci in pus from a surgical abscess, and Friedrich Julius Rosenbach subsequently established the genus and distinguished S. aureus from the organism now known as S. epidermidis.
The genus contains commensal organisms of the skin and mucous membranes of humans and other animals, as well as opportunistic pathogens. S. aureus can cause community- and healthcare-associated infections, and antibiotic-resistant strains such as methicillin-resistant Staphylococcus aureus (MRSA) can cause serious disease.
How this connects to Microbiology
To study this topic responsibly, identify its normal structure or function, distinguish the main mechanism from its observable consequences, and ask which data can test a competing explanation. The subject foundations below outline these connections without pretending to be a specialist textbook chapter.
Text credit: Wikipedia contributors, “Staphylococcus”, original article · authors & revision history · CC BY-SA 4.0. Unmodified opening extract, accessed 24 September 2026. This Wikipedia-derived section is provided under CC BY-SA 4.0; the independent MedAtlas notes and design are separate works.
Staphylococci and streptococci · visual study map
Scalable vector illustration. Labeled conceptual map, not a precise anatomical, histological or diagnostic image.The wording in this learning map is adapted from the attributed Wikipedia background section below (CC BY-SA 4.0).
What the underlying subject studies
Microbiology studies organisms and the interaction between a microbe, its environment and its host. Identify the organism category, structural features, route of transmission and host response before learning a diagnostic method.
How mechanisms and evidence connect
Organism detection is not the same as proof that it is causing disease. Specimen site, collection quality, microbial burden, clinical presentation and relevant susceptibility tests influence interpretation.
How to develop a sound explanation
Compare microbial groups by structure, replication and infection-control requirements. Draw a life cycle or transmission chain when appropriate, and distinguish laboratory screening, confirmation and therapy decisions.
References and verification (optional)
All reading material on this page appears above. The links below are for checking the primary syllabus, research or source attribution, not requirements for opening this lesson.
NMC official CBME Curriculum 2024 and current regulations index ↗