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Transmission intensity index to monitor filariasis infection pressure in vectors for the evaluation of filariasis elimination programmes
Author(s) -
Sunish I. P.,
Rajendran R.,
Mani T. R.,
Munirathinam A.,
Tewari S. C.,
Hiriyan J.,
Gajanana A.,
Reuben R.,
Satyanarayana K.
Publication year - 2003
Publication title -
tropical medicine and international health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.056
H-Index - 114
eISSN - 1365-3156
pISSN - 1360-2276
DOI - 10.1046/j.1365-3156.2003.01109.x
Subject(s) - filariasis , transmission (telecommunications) , psychological intervention , medicine , index (typography) , environmental health , veterinary medicine , socioeconomics , immunology , telecommunications , computer science , helminths , psychiatry , sociology , world wide web
Summary We conducted longitudinal studies on filariasis control in Villupuram district of Tamil Nadu, south India, between 1995 and 2000. Overall, 23 entomological (yearly) data sets were available from seven villages, on indoor resting collections [per man hour (PMH) density and transmission intensity index (TII)] and landing collections on human volunteers [PMH and annual transmission potential (ATP)]. All four indices decreased or increased hand‐in‐hand with interventions or withdrawal of inputs and remained at high levels without interventions under varied circumstances of experimental design. The correlation coefficients between parameters [PMH: resting vs . landing ( r = 0.77); and TII vs. ATP ( r = 0.81)] were highly significant ( P < 0.001). The former indices from resting collections stand a chance of replacing the latter from landing collections in the evaluation of global filariasis elimination efforts. The TII would appear to serve the purpose of a parameter that can measure infection pressure per unit time in the immediate household surroundings of human beings and can reflect the success or otherwise of control/elimination efforts along with human infection parameters. Moreover, it will not pose any additional risk of new infection(s) and avoids infringement of human rights concerns by the experimental procedures of investigators, unlike ATP that poses such a risk to volunteers.