Strepto means chain
and Coccus means seed . Any of a group of bacter Strepto means chain and Coccus means seed .
Any of a group of bacteria which as they remain attached after fission are
usually found in chains .
Morphology
i)
Shape and size – These are spherical or ovoid cocci ,
average diameter is 0.5 to 1 μ
ii)
Arrangement – Arrranged in chain usually but
streptococcus faecalis which is present in the intestinal tract is usually
arranged in pairs or short chains .
iii)
Non motile due to absence of flagellum .
iv)
Non – sporing
v)
Non-capsulated .
Disease produced by streptococcus
( A) By Streptococcus
haemololyticus –
1.. Infection of
skin subcutaneous tissue and lymphatics
a) Impetigo
contagiosa
b) Paronychia-
infection of semilunar fold at the base of the nail
c) Erysipelas-
Spread through lymphatic and tissue spaces of cutis and septicaemia may occur .
d) Cellulitis
.
e) Ludwing’s
angina – a type of cellulites of the
floor of mouth . It may extend to the neck or throat .
f)
Wound infection .
g) Lymphangitis
– inflammation of lymphatic vessels .
2.. Infection of
respiratory tract with mouth and throat …
a) Epidemic
sore throat
b) Acute
follicular tonsillitis
c) Lungs
– broncho pneumonia
d) Scarlet
fever .
3… Infection of
Genito urinary tract
a) Kidney
- Acute nephritis .
b) Lesion
of endometrium – endometritis
c) Testes
and epididymes – epididymo-orchitis will produce .
4… Heart – Acute bacterial endocarditis and
pericarditis .
5.. Brain -
Meningitis may occur due to septicaemia or from otitis media and
mastoiditis .
(B)…. By Streptococcuus viridans ---
a) Teeth
– Pyorrhoea , alveolitis and apical absecess .
b) Throat
– chronic tonsillitis and pharyngitis .
c) Appendix
– Appendicitis .
d) Stomach
– peptic ulcer
e) Heart
– sub acute bacterial endocarditis .,
f)
Gall bladder – Chronic chole cystitis .
No comments:
Post a Comment