lecture 1 staphylococcus family micrococcaceae

Genera in micrococcaceae

• micrococcus

• Stomatococcus

• Planococcus

• Staphylococcus

-first 3 are saprophytic , staphylococcus is pathogenic

Most important pathogen

Staphylococcus aureus

• aureus

• Anerobicus

Other species

• s. Epidermidis ( s capitis, haemolyticus, saccharolyticus, hominis, warnery)

• S. Saprophyticus( s. Colmii, s.xylosus)

• S. Simulans (s. Carnosus)

• S. Sciuri (s. Lentus)

Shape size and arangement motility 02 need

• gram + spherical, ovoid cocci

• 1 nm in diameter ( 0.5-1.5)

• Clusters(like grapes) due to division in different planes

• Non motile

• Facultative anaerobes

Growth conditions (temperature, pH, time)

• 6.5- 46 opt 35-40

• 7 - 7.8 pH

• Visible after 5-6h abundant after 24 h

Culture characteristics( broth, colonies)

• broth: uniform turbidity w loose sediment

• Colonies on solid media : 2-4mm round smooth opaque convex creamy shiny (s form). Dry rough colonies (r- form) are rare. Dwarf(g colonies) form if theres antimicrobials

Halophilic activity