Effect of Multiple Rounds of Mass Drug Administration under Lymphatic Filariasis Elimination Program on Prevalence of Soil-Transmitted Helminthiasis in One of the Co-endemic Districts of India

Both soil-transmitted helminthiasis and lymphatic filariasis are co-endemic in some districts of India. The study was aimed at comparing the prevalence of soil-transmitted helminthiasis (STH) infection before and after mass drug administration (MDA) given for lymphatic filariasis at Alappuzha.We examined stool samples of 219 children aged between 9 and 10 years from nine schools at Alappuzha, Kerala, in June 2015. The current STH situation was compared with that in the year 1999 (before the institution of MDA) in the same age group in the same district. WHO-recommended Kato-Katz technique was used for STH prevalence estimation. Information regarding socio-demographic variables, sanitation, personal hygiene practices was also recorded. Chi-square test was used to study association of risk factors with STH infection.A total of 79 (36.07%) children were found to be positive for STH infection. Out of all samples positive for Ascaris lumbricoides, 4 (5%) were found co-infected with Trichuris trichiura and none with hookworm. Factors like absence of household latrine, lack of hand washing before meals and practice of consumingunwashed fruits were found to be significantly associated with occurrence of STH infection.Over the years, consecutive rounds of MDA for LF have led to a decline in intestinal worm burden but with little effect on the overall prevalence of STH. Thus, STH control activities working synergistically with the Filarial Elimination Strategy can yield better results in the co-endemic areas with optimum resourceutilization

Two new species of Asialeyrodes Corbett (Aleyrodidae: Homoptera) from India

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Current Status of Bancroftian Filariasis in Palakkad District, Kerala

Earlier studies indicated high prevalence of filariasis in Palakkad district, Kerala. Therefore, a cross-sectional parasitological study was conducted to assess the microfilarial prevalence in Palakkad town and 31 rural panchayats. A total of 6747 night blood smears were collected by cluster sampling technique and were examined for microfilariae. Palakkad town and 16 panchayats are found positive for lymphatic filariasis. The overall mf rate was 4.08% ranging from 0.5% to 7.56%. Entomological studies done in Palakkad town and five rural panchayats at random showed vector infection and infectivity in Malampuzha panchayat (6.45% each). The study indicates that filariasis is spreading into newer areas in Palakkad district. There is an urgent need to identify all the endemic areas and to implement the future MDA rounds effectively along with integrated vector control strategies in specific areas, so that the spread of filariasis can be prevented

Canine Filarial Infections in a Human Brugia malayi Endemic Area of India

A very high prevalence of microfilaremia of 42.68 per cent out of 164 canine blood samples examined was observed in Cherthala (of Alappuzha district of Kerala state), a known human Brugia malayi endemic area of south India. The species of canine microfilariae were identified as Dirofilaria repens, Brugia malayi, and Acanthocheilonema reconditum. D. repens was the most commonly detected species followed by B. pahangi. D. immitis was not detected in any of the samples examined. Based on molecular techniques, microfilariae with histochemical staining pattern of “local staining at anal pore and diffuse staining at central body” was identified as D. repens in addition to those showing acid phosphatase activity only at the anal pore. Even though B. malayi like acid phosphatase activity was observed in few dogs examined, they were identified as genetically closer to B. pahangi. Hence, the possibility of dogs acting as reservoirs of human B. malayi in this area was ruled out