| Question | Answer | Article | |
| What bacterium causes ERM? | Yersinia ruckeri
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| What morphological features does the bacterium have? |
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| What is the main predisposing factor for clinical disease? | Poor water quality
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| What age of fish are most commonly affected? | Young fish 1-5months old
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| What causes the redness of the mouth that gives the disease its name? | Subcutaneous haemorrhage.
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| What signs are seen in small fry? | Often no signs are seen, only sudden mortalities
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| What tissue samples and what agar should be used for culture? |
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