Table 3. Percentage reduction in microfilarial density.

	S1	S2	H1	H2
6 Months	84.2	80.3	82.9	85.6
12 Months	92.0	95.2	93.0	97.3
18 Months	98.2	98.1	98.8	99.4
24 Months	99.1	99.4	99.8	99.8

Reduction in mf count in the individuals from each treatment arm from baseline values was calculated at the different follow up points and expressed as percentages. It shows sharp decline at 6 months follow up with gradual reduction thereafter. The difference between the arms is not significant.