Incidence of Lymphatic Filariasis by microfilaraemic prevalence in a study
area of Kalutara district, Sri Lanka has been analysed here. Trends of annual
prevalence data are parsimoniously identified by least square method. There
are no marked fluctuations in microfilaraemic prevalence at the initial stage
of the whole study period from 1977 to 2005. Middle period is associated
with fluctuations and continuous decrease is evident at the final stage. These
prevalence patterns are interpreted in terms of adverse effects of urbanisation
and also in terms of beneficial effects of the mass treatment programme.