الفهرس 
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Abstract
Streptococcal infection caused by Streptococcus iniae is
the most common Gram positive infection affecting cultured
freshwater fish. Streptococcal infection causes high economic
losses in fish production and is zoonotic to human. This work
was planed to determine the effective antibiotics against
Streptococcus iniae followed by a trial for treatment of
experimentally infected Oreochromis niloticus. The obtained
results revealed that Florfenicol and norfloxacin are the most
effective antibiotics against Streptococcus iniae at a dose of 50
and 100 mg / Kg. B. W. orally once daily for 7 days. With
vigilance oxytetracycline at a dose of 100 mg / Kg. B. W.
orally once daily for 7 days can be used in treatment of such
infection.