Volume 31, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Following the final chemotherapy campaign of a 4-year program, the biological assessment of transmission of was evaluated for 5 years. No infected were found amongst 28,791 and 13,550 snails examined from flowing and static index sites, respectively. However, 89 infected snails of 16,602 examined (0.54%) were found from additional sites. Sentinel snails examined between March 1974 and October 1977 revealed no infections and their use was discontinued. Following an increase in transmission, routine focal mollusciciding at 4-weekly intervals was introduced in March 1980. The cost for eight applications was US$641, representing a cost per caput of $0.21. These figures, extrapolated to a full year's control, become $1,042 and $0.35, respectively. The maximum cost was for the molluscicide, which absorbed 71.5% of the total. The data suggest that the main transmission of occurs in the dry season, in flowing habitats, as it does elsewhere in St. Lucia.


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