Journal
AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE
Volume 79, Issue 3, Pages 344-352Publisher
AMER SOC TROP MED & HYGIENE
DOI: 10.4269/ajtmh.2008.79.344
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Funding
- National Health Research Institute, Taipei, Taiwan [NHRI-CN-CL9302P]
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This study analyzed the spatio-temporal patterns of 4,587 (94% of the total) confirmed dengue cases in Kaohsiung and Fengshan Cities (a two-city area) that occurred in Taiwan from 2001 to 2003. The epidemic had two simultaneous distinct diffusion patterns. One was a contiguous pattern, mostly limited to I km from an initial cluster, reflecting that there was a rapid dispersal of infected Aedes aegypti and viremic persons. The second followed a relocation pattern, involving clusters of cases that diffused over 10 weeks starting from the southern and moving to the northern parts of the two-city area. The virus from one clustering site jumped to several distant areas where it rapidly dispersed through a series of human-mosquito transmission cycles to several localities. In both patterns, transmission of disease quickly enlarged the epidemic areas. Future dengue control efforts would benefit from a timely syndromic surveillance system plus extensive public education on how to avoid further transmission.
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