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Toxoplasma antibodies were absent from the sera of 32 adult Hong Kong women and were present in only two of 35 adult males and five of 46 meat workers, an overall incidence of 6·2%. This is the lowest incidence recorded in a large tropical city and lower than the incidence reported for most areas of the world, whether rural or urban. The reasons for this are unknown. Of 31 sera from swine imported from China and slaughtered in Hong Kong, 22 (71%) were positive for toxoplasma antibodies.