7.3.2.Vaccination vs chemotherapy: advantages and disadvantages
7.3.2.Vaccination vs chemotherapy: advantages and disadvantages
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Sl.No
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Vaccination
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Chemotherapy / antibiotics
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1
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Prophylactic: few if any losses from a disease
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:
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Curative: some mortalities before treatment is effective
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2
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Prophylactic for long duration with only one or two treatments
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:
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Prophylactic for only a short period; constant treatment required
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3
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Vaccination: all fish receive treatment
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:
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Mostly antibiotics are given in food, but sick fish are often anorexic and do not receive treatment
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4
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No toxic side effects, and healthy fish have better growth performance
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:
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Toxic side effects may be considerable: treatment relies on differential toxicity between host and the pathogen for a therapeutic index; growth often arrested
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5
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No accumulation of toxic residues
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:
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Toxic residues remain: a time lapse is required between treatment and marketing of fish
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6
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Pathogen unlikely to develop resistance
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:
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Many bacteria develop resistance to antibiotics
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7
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No legal restriction on “safe” vaccines
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:
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Use of antibiotics are restricted due to risk of development of antibiotic resistant strains
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8
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Theoretically, can control any disease
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:
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Chemotherapy limited: cannot control viral diseases
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9
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No environmental impact
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:
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Chemicals may disrupt local environment
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Last modified: Monday, 30 January 2012, 9:27 AM