An attempt to evaluate the spreading of Taenia saginata eggs in the environment.

Taeniid eggs may be transmitted either abi-otically by e.g. sewage disposal, rainfall and water streams or biotically by vectors as her-bivores, birds and insects. Among the insects especially the flies may play an important role as shown in New Zealand by Lawson & Gemmell (1983, 1985). The fly-borne trans-mission may take place over long distances. Lawson & Gemmell (1983) evaluated that the majority of eggs would be deposited within 1.6 km from their point of origin, but some eggs might be spread even longer.