Translations:Advanced Field Epi:Manual 1 - Disease Investigation/104/en

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There were 1000 small fish in the pond and 300 had EUS and there were 1000 large fish of which 100 developed EUS during the outbreak. The attack rates here are 30% and 10% respectively, suggesting that small fish were 3 times more likely to develop EUS than large fish. This finding could lend support to a hypothesis that nutritionally stressed fish are more susceptible to infection.