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An attempt to predict the rate of spread of and economic losses due to Parafiliaria bovicola infections in Swedish cattle was made for a 20-year period using the best epidemiological data available. By 1990, yearly losses in the absence of a control program may amount to 40 million Swedish crowns (8 million U.S.$). The estimated losses were compared to four presumptive eradication measures: (i) pharmaceutical treatment of cows with cutaneous Parafilaria bleeding, (ii) culling of bleeding cows, (iii) indoor management of bleeding cows, and (iv) pharmaceutical treatment of young livestock going to slaughter. Only the first three control programs will theoretically result in eradication of the parasite. The calculated benefit—cost ratios were 30.0, 5.9, 5.9 and 1.9 for (i), (ii), (iii) and (iv), respectively. |
