In "black carp and sick cows" (Editorial, 13 Apr., p. 169), Donald Kennedy illustrates that globalization of trade, travel, and transport can have unintended negative consequences, namely, the relocation and establishment of invasive species (1). He is justifiably concerned that there is too little awareness of this international threat and no general strategy for dealing with the invaders.
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Waage et al. (2001) studied this question.