AGf~ICULTURAL RESEARCH, PUSA.

CHAPTER IX
THE PYOGENIC COCCI AND OTHER
ORGANISJHS ASSOCIATED 'VITH
THE COMMONER SUPPURATIVE
CONDITIONS; ORGANISl\lS ASSOeLATED
VFI'I'H CONJUNCTIVITIS;
PNEUMOCOCCUS
PYOGENIC COCCI
THESE organisms arc found in various acute inflammatory
and suppurative conditions. They are assodated
with pus formation, and arc therefore designated
"pyogenic." The most freqncnt are:
Stllph,lJloCOCCU8 (1Jijop,cncs) (('UI'CU8, and
1')'tl't'ptOC()CCIiS hacmolylicus.
STAPHYLOCOCCUS AUREUS
]Jlorphology.-Spherieal cocci arranged in irregular
clusters, the individual cells being approximately
0'8-0'!)/1, in diameter. Single forms and pairs may also
be noted.
S ta-ining .-' . Gram -positive.
Culiu.l'c.-Aerobc and facultative u,llacrohe; telllperature
range--lOO-42° C., optillllUn-37° C.; growth
occurs on ordinary nutrient media.
Agar stroke-thick, opaque, moist, shiny, "oilpaint
"-like growth which develops a characteristic
golden or orange-yellow colour.
Colonies on agar-circular discs, relatively large even
after 24, hours (2-3 mm. in diameter), and presenting
the same characters as the stroke culture.
249