SPOTTED FEVER
Written by Dr.ChrisSPOTTED FEVER: Rickettsiae of this group possess common soluble antigen and multiply in nucleus and cytoplasm of host cell. They are all transmitted by tick except Rickettsiae akari which is mite borne.
Rickettsiae are transmitted transovarialiy in ticks. The infection may be transmitted by larval stages or by adult ticks. The ticks are not harmed by […]
Tags: arabinose, glucose, lactose, mannital acetoin, Staphyloccus aureus, Staphylococcus albus, Staphylococcus citreus
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STREPTOCOCCUS PYOGENES
Written by Dr.ChrisSTREPTOCOCCUS PYOGENES: Morphology: It is 0.5 to 1,u in diameter and arranged in chain. Chain formation is due to cocci dividing in one plane only and failure of daughter cell to separate completely. The length of a chain depends upon medium on which organism is grown. It is usually encapsulated, non sporing and non motile. […]
Tags: arabinose, glucose, lactose, mannital acetoin, Staphyloccus aureus, Staphylococcus albus, Staphylococcus citreus
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ALFA HEMOLYTIC STREPTOCOCCI
Written by Dr.ChrisALFA HEMOLYTIC STREPTOCOCCI: Some streptococci do not produce soluble hemolysin. It is characterised by production of alfa hemolytic colonies on blood agar.
It includes:
(a) Streptococcus viridans.
(b) Streptococcus mitis.
(c) Streptococcus M.G.
(d) Streptococcus salivarium
Streptococcus viridans: It is present as commensal on mucosa of mouth, nasopharynx and saliva of man. On the basis of biochemical reactions it is classified into 5 species (Streptococcus […]
Tags: arabinose, glucose, lactose, mannital acetoin, Staphyloccus aureus, Staphylococcus albus, Staphylococcus citreus
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Classification of Staphylococcus
Written by Dr.ChrisClassification of Staphylococcus:
A. On the basis of pigment production 3 types of staphylococci are identified.
(1) Staphyloccus aureus produces golden yellow colonies and are pathogenic.
(2) Staphylococcus albus produces white colonies and are non pathogenic.
(3) Staphylococcus citreus produces lemon yellow colonies and are non pathogenic.
B. On the basis of pathogenecity:
(1) Pathogenic species Staphylococcus aureus.
(2) Non pathogen species Staphylococcus epidermides.
C. Baird-Parker classified staphylococci […]
Tags: arabinose, glucose, lactose, mannital acetoin, Staphyloccus aureus, Staphylococcus albus, Staphylococcus citreus
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