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Relationship between seroprevalence and body condition (weight/forearm ratio). Points represent mean seroprevalence per field season as a function of mean body weight/forearm ratio for adult non-pregnant females (squares and solid line) and adult males (diamonds and dashed line). Dividing body weight by forearm measurement accounts for body size and therefore gives a crude measurement of body condition. 1, spring 2004; 2, autumn 2005; 3, winter 2005; 4, spring 2005; 5, autumn 2006.
