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A Brugia malayi antigen specifically recognized by infected individuals

Rahmah N, Anuar AK, A'shikin AN, Lim BH, Mehdi R, Abdullah B, et al.

Biochem Biophys Res Commun, 1998 Sep 29;250(3):586-8.
PMID: 9784388

Western blot analyses were performed on 444 serum specimens: 40 sera from microfilaraemic individuals, 10 sera from elephantiasis patients, 24 treated individuals, 50 sera from residents of endemic areas without anti-filarial IgG4 antibodies (endemic normals), 20 sera from amicrofilaraemic individuals with high anti-filarial IgG4 antibodies, 200 sera from healthy city-dwellers (non-endemic samples), and 100 sera from soil-transmitted helminth-infected individuals. Phast electrophoresis system was used to electrophorese Brugia malayi soluble adult worm antigen on 10-15% SDS-PAGE gradient gels followed by electrophoretic transfer onto PVDF membranes. Membrane strips were then successively incubated with blocking solution, human sera, and monoclonal anti-human IgG4 antibody-HRP, with adequate washings done in between each incubation step. Luminol chemiluminescence detection was then used to develop the blots. An antigenic band with the MW of approximately 37 kDa was found to be consistently present in the Western blots of all microfilaraemic sera, all amicrofilaraemic sera with high titres of anti-filarial IgG4 antibodies, some treated patients, and some elephantiasis patients. The antigen did not occur in immunoblots of individuals with other helminthic infections, normal endemic individuals, and city dwellers. Therefore the B. malayi antigen of with the MW of approximately 37 kDa demonstrated specific reactions with sera of B. malayi-infected individuals and thus may be useful for diagnostic application.

Matched MeSH terms: Elephantiasis, Filarial/blood; Elephantiasis, Filarial/immunology*
A case of double infection with Brugia pahangi Buckley and Edeson 1956, and Dirofilaria immitis Leidy 1856, in a Malaysian clouded leopard, Neofelis nebulosa

Zahedi M, Vellayan S, Jeffery J, Krishnasamy M

Vet Parasitol, 1986 Jun;21(2):135-7.
PMID: 3739206

A case of double infection with Brugia pahangi and Dirofilaria immitis in a clouded leopard, Neofelis nebulosa, is presented. A brief review of filarial infections in both man and wild animals, and their medical importance is discussed.

Matched MeSH terms: Elephantiasis, Filarial/complications; Elephantiasis, Filarial/veterinary*
Fulltext A randomized controlled trial of increased dose and frequency of albendazole with standard dose DEC for treatment of Wuchereria bancrofti microfilaremics in Odisha, India

Kar SK, Dwibedi B, Kerketa AS, Maharana A, Panda SS, Mohanty PC, et al.

PLoS Negl Trop Dis, 2015 Mar;9(3):e0003583.
PMID: 25781977 DOI: 10.1371/journal.pntd.0003583

Although current programmes to eliminate lymphatic filariasis have made significant progress it may be necessary to use different approaches to achieve the global goal, especially where compliance has been poor and 'hot spots' of continued infection exist. In the absence of alternative drugs, the use of higher or more frequent dosing with the existing drugs needs to be explored. We examined the effect of higher and/or more frequent dosing with albendazole with a fixed 300 mg dose of diethylcarbamazine in a Wuchereria bancrofti endemic area in Odisha, India. Following screening, 104 consenting adults were randomly assigned to treatment with the standard regimen annually for 24 months (S1), or annually with increased dose (800 mg albendazole)(H1) or with increased frequency (6 monthly) with either standard (S2) or increased (H2) dose. Pre-treatment microfilaria counts (GM) ranged from 348 to 459 mf/ml. Subjects were followed using microfilaria counts, OG4C3 antigen levels and ultrasound scanning for adult worm nests. Microfilarial counts tended to decrease more rapidly with higher or more frequent dosing at all time points. At 12 months, Mf clearance was marginally greater with the high dose regimens, while by 24 months, there was a trend to higher Mf clearance in the arm with increased frequency and 800 mg of albendazole (76.9%) compared to other arms, (S1:64%, S2:69.2% & H1:73.1%). Although higher and/or more frequent dosing showed a trend towards a greater decline in antigenemia and clearance of "nests", all regimens demonstrated the potential macrofilaricidal effect of the combination. The higher doses of albendazole did not result in a greater number or more severe side effects. The alternative regimens could be useful in the later stages of existing elimination programmes or achieving elimination more rapidly in areas where programmes have yet to start.

Matched MeSH terms: Elephantiasis, Filarial/drug therapy*
Advances in immunology and immunopathology of lymphatic filariasis

Mak JW

Southeast Asian J. Trop. Med. Public Health, 1993;24 Suppl 2:76-81.
PMID: 7973952

The lymphatic filarial parasites which affect about 90 million people worldwide have similar host-parasite relationships in man. They are all able to survive, reproduce and cause chronic infections if they can successfully evade the protective responses of the host. Studies to investigate the wide spectrum of clinical manifestations of the infection even among those living in similar endemic areas and with presumed equal exposure to infective larvae, have been hampered by the lack of animal models showing similar host-parasite responses. The recent use of the nude mouse infected with Brugia spp, and the leaf-monkey (Presbytis spp) infected with B. malayi or Wuchereria spp for the study of immune responses and the associated pathology of these infections, has elucidated some of the host protective immune responses as well as the associated immunopathological reactions. The successfully entrenched parasite elicits minimal reactions and pathology, but with the onset of effective host responses, whether assisted by chemotherapy, development of protective immunity or both, severe inflammatory responses may occur. The role of such immune mediated response in determining subsequent pathology will probably be dependent on the frequency and duration of these episodes, but these have yet to be defined. Prenatal and perinatal sensitization by filarial antigens are postulated to result in tolerance and/or modification of immune responses to subsequent infections. A role for genetic predisposition to certain clinical outcomes, for example, the development of elephantiasis, has been postulated but needs further study. Advances have also been achieved in defining those parasite antigens/products involved in eliciting or suppressing protective and other immune responses.(ABSTRACT TRUNCATED AT 250 WORDS)

Matched MeSH terms: Elephantiasis, Filarial/immunology*; Elephantiasis, Filarial/physiopathology
Fulltext Anti-Wolbachia therapy for onchocerciasis & lymphatic filariasis: Current perspectives

Wan Sulaiman WA, Kamtchum-Tatuene J, Mohamed MH, Ramachandran V, Ching SM, Sazlly Lim SM, et al.

Indian J Med Res, 2019 06;149(6):706-714.
PMID: 31496523 DOI: 10.4103/ijmr.IJMR_454_17

Onchocerciasis and lymphatic filariasis (LF) are human filarial diseases belonging to the group of neglected tropical diseases, leading to permanent and long-term disability in infected individuals in the endemic countries such as Africa and India. Microfilaricidal drugs such as ivermectin and albendazole have been used as the standard therapy in filariasis, although their efficacy in eliminating the diseases is not fully established. Anti-Wolbachia therapy employs antibiotics and is a promising approach showing potent macrofilaricidal activity and also prevents embryogenesis. This has translated to clinical benefits resulting in successful eradication of microfilarial burden, thus averting the risk of adverse events from target species as well as those due to co-infection with loiasis. Doxycycline shows potential as an anti-Wolbachia treatment, leading to the death of adult parasitic worms. It is readily available, cheap and safe to use in adult non-pregnant patients. Besides doxycycline, several other potential antibiotics are also being investigated for the treatment of LF and onchocerciasis. This review aims to discuss and summarise recent developments in the use of anti-Wolbachia drugs to treat onchocerciasis and LF.

Matched MeSH terms: Elephantiasis, Filarial/drug therapy*; Elephantiasis, Filarial/microbiology; Elephantiasis, Filarial/epidemiology
Fulltext Antibodies to somatic L3 antigen not protective against Brugia malayi infection

Noordin R, Abdullah KA, Azahri NA, Ramachandran CP

Southeast Asian J. Trop. Med. Public Health, 1999 Dec;30(4):678-81.
PMID: 10928359

Western blot analysis of infective larvae (L3) antigen of Brugia malayi were performed on 200 sera from six groups of individuals: 36 samples from B. malayi microfilaremic individuals; 10 samples from individuals with elephantiasis; 50 and 20 samples from amicrofilaremic individuals in a B. malayi endemic area with no anti-filarial IgG4 antibodies (towards microfilaria and adult worm antigens) and samples with high titres of the anti-filarial IgG4 antibodies respectively; 50 samples from non-endemic normals and 34 samples from geohelminth-infected individuals. After protein transfer, PVDF membrane strips were successively incubated with blocking solution, human sera, monoclonal anti-human IgG4 antibody-HRP and developed with luminol chemiluminescence substrate. 28/36 (78%), 1/10 (10%) and 16/20(80%) of sera from individuals with microfilariae, elephantiasis and amicrofilaremic individuals with high titers of anti-filarial IgG4 antibodies respectively recognized L3 antigenic epitopes; the dominant and consistent antigenic bands were of approximately MW 43 kDa, 14 kDa, 15 kDa and 59 kDa. The rest of the sera were unreactive. This study showed that microfilaremics may or may not mount a notable antibody response to somatic L3 antigens, thus lending evidence that antibody response to this antigen is not protective against establishment of Brugia malayi infection.

Matched MeSH terms: Elephantiasis, Filarial/immunology*; Elephantiasis, Filarial/parasitology; Elephantiasis, Filarial/prevention & control
Antifilarial activity of CGP 20376 against subperiodic Brugia malayi in the leaf-monkey Presbytis cristata

Mak JW, Suresh K, Lam PL, Choong MF, Striebel HP

Trop. Med. Parasitol., 1990 Mar;41(1):10-2.
PMID: 2339241

CGP 20376, a 5-methoxyl-6-dithiocarbamic-S- (2-carboxy-ethyl) ester derivative of benzothiazole was evaluated for its antifilarial properties and shown to be extremely effective against subperiodic Brugia malayi in the leaf-monkey, Presbytis cristata at oral doses of 20-100 mg/kg. The compound and/or its metabolites had complete micro- and microfilaricidal activities even when given at a single dose of 20 mg/kg. Lower doses had incomplete filaricidal action.

Matched MeSH terms: Elephantiasis, Filarial/drug therapy*
Antifilarial activity of intravenous suramin and oral diethylcarbamazine citrate on subperiodic Brugia malayi in the leaf-monkey, Presbytis cristata

Mak JW, Lam PL, Choong MF, Suresh K

J Helminthol, 1990 Jun;64(2):96-9.
PMID: 2387979

The known filaricides, suramin and diethylcarbamazine citrate, were tested against subperiodic Brugia malayi infection in the leaf-monkey, Presbytis cristata. As expected, intravenous suramin at 10 mg/kg daily x 5 days or 17 mg/kg weekly x 5 weeks, did not show any microfilaricidal activity, but substantially reduced the recovery of live adult worms to 50.6% and 13.6% of controls respectively. Oral diethylcarbamazine citrate at 6 mg/kg daily x 6 or 10 days reduced final microfilarial counts to 30% of initial counts four weeks post-treatment and adult worm recovery was reduced to 4.5% and 0% of controls respectively. Although the antifilarial activity of these drugs against the infection in this non-human primate model appears to be similar to that seen in man, these results have to be confirmed using larger groups of animals.

Matched MeSH terms: Elephantiasis, Filarial/drug therapy*
Fulltext Antifilarial compounds in the treatment and control of lymphatic filariasis

Mak JW

Trop Biomed, 2004 Dec;21(2):27-38.
PMID: 16493396

Diethylcarbamazine citrate (DEC) has been used for treatment and control of lymphatic filariasis since the 1950s. Although this remarkable drug is still useful and modified strategies in its usage have been developed, a number of newer antifilarial compounds are now available. Numerous field trials evaluating their efficacy in the control of lymphatic filariasis have been conducted. In particular, ivermectin (IVM), albendazole (ALB), and DEC have been tested singly and in combinations and the results of such field studies should be evaluated. While most of the studies were based on efficacy in the clearance of microfilaraemia, a few clinical trials evaluated the adulticidal activity of these compounds. Some antibiotics are effective in killing Wolbachia bacteria symbionts of filarial worms, but their role in the chemotherapy of lymphatic filariasis is still undefined. This review of randomised controlled field studies and randomised controlled clinical trials with these compounds will summarise the findings and give recommendations on their appropriate use for the control and treatment of lymphatic filariasis.

Matched MeSH terms: Elephantiasis, Filarial
Applications of biotechnology in parasitic diseases in Malaysia

Mak JW, Yong HS, Lim PK, Tan MA

Southeast Asian J. Trop. Med. Public Health, 1988 Mar;19(1):7-9.
PMID: 3406806

Biotechnological tools are being used in malaria, filariasis and dengue research. The main emphasis has been on the production of reagents for immunodiagnosis and research. In this respect monoclonal antibodies (McAbs) against various species and stages of the above pathogens have been produced. It is hoped that these McAbs will be useful not only in immunodiagnosis but also for seroepidemiological applications. A DNA probe against Brugia malayi has been tested in Malaysia and was found to be sensitive and specific.

Matched MeSH terms: Elephantiasis, Filarial/diagnosis
Fulltext Assessing seroprevalence and associated risk factors for multiple infectious diseases in Sabah, Malaysia using serological multiplex bead assays

Chan YL, Patterson CL, Priest JW, Stresman G, William T, Chua TH, et al.

Front Public Health, 2022;10:924316.
PMID: 36388287 DOI: 10.3389/fpubh.2022.924316

BACKGROUND: Infectious diseases continue to burden populations in Malaysia, especially among rural communities where resources are limited and access to health care is difficult. Current epidemiological trends of several neglected tropical diseases in these populations are at present absent due to the lack of habitual and efficient surveillance. To date, various studies have explored the utility of serological multiplex beads to monitor numerous diseases simultaneously. We therefore applied this platform to assess population level exposure to six infectious diseases in Sabah, Malaysia. Furthermore, we concurrently investigated demographic and spatial risk factors that may be associated with exposure for each disease.
METHODS: This study was conducted in four districts of Northern Sabah in Malaysian Borneo, using an environmentally stratified, population-based cross-sectional serological survey targeted to determine risk factors for malaria. Samples were collected between September to December 2015, from 919 villages totaling 10,100 persons. IgG responses to twelve antigens of six diseases (lymphatic filariasis- Bm33, Bm14, BmR1, Wb123; strongyloides- NIE; toxoplasmosis-SAG2A; yaws- Rp17 and TmpA; trachoma- Pgp3, Ct694; and giardiasis- VSP3, VSP5) were measured using serological multiplex bead assays. Eight demographic risk factors and twelve environmental covariates were included in this study to better understand transmission in this community.
RESULTS: Seroprevalence of LF antigens included Bm33 (10.9%), Bm14+ BmR1 (3.5%), and Wb123 (1.7%). Seroprevalence of Strongyloides antigen NIE was 16.8%, for Toxoplasma antigen SAG2A was 29.9%, and Giardia antigens GVSP3 + GVSP5 was 23.2%. Seroprevalence estimates for yaws Rp17 was 4.91%, for TmpA was 4.81%, and for combined seropositivity to both antigens was 1.2%. Seroprevalence estimates for trachoma Pgp3 + Ct694 were 4.5%. Age was a significant risk factors consistent among all antigens assessed, while other risk factors varied among the different antigens. Spatial heterogeneity of seroprevalence was observed more prominently in lymphatic filariasis and toxoplasmosis.
CONCLUSIONS: Multiplex bead assays can be used to assess serological responses to numerous pathogens simultaneously to support infectious disease surveillance in rural communities, especially where prevalences estimates are lacking for neglected tropical diseases. Demographic and spatial data collected alongside serosurveys can prove useful in identifying risk factors associated with exposure and geographic distribution of transmission.

Matched MeSH terms: Elephantiasis, Filarial*
Fulltext Associated factors for lymphatic filariasis in Beluran, Sabah

Nur Dalila Zakaria, Richard Avoi

Malaysian Journal of Medicine and Health Sciences, 2019;15(106):23-23.
MyJurnal

Introduction: : Lymphatic filariasis is a public health problem in Malaysia. In sub-district Tangkarason, Beluran the nine rounds of Mass Drug Administration (MDA) do not seem to work in reducing the microfilaria (Mf) prevalence below the 2% threshold that the World Health Organization (WHO) recommends for stopping MDA. The study aims to identify possible factors contributing to the transmission of lymphatic filariasis in the area. Methods: A total of 244 individuals from seven high risk localities, whom between the age of 19 and 99-year-old, were interviewed and tested for lymphatic filariasis antibody. The associated factors were analyzed using Chi-square test (Fisher exact test where applicable) and odds ratio (OR), and adjusted odds ratio (AOR) was estimated using logistic regression. Re-sults: The median age was 40-year-old (interquartile range: 30-53). The prevalence of brugian filariasis in the studied population was 31.1% (95% CI 0.25, 0.37). Prevalence of brugian filarial infection is higher in males than in females (34.6% vs. 27.4%, P = 0.219); and in older adults (≥ 56-year-old) than in young-and-middle-aged adults (46.3% vs 26.8%, P = 0.006). The older group is 2.4 times at higher odd of contracting the disease than the younger adults (95% CI 1.26, 4.38; P = 0.007). The prevalence of brugian filarial infection is higher among those who never receive pro-phylaxis treatment compared to those who had received medications (48.5% vs 28.4%, p = 0.021). Those who had received prophylaxis treatment have about 60% reduction in odd of lymphatic filariasis infection (OR 0.42; 95% CI 0.20, 0.89; P = 0.023). The proportion of the studied population who has outdoor jobs is 52.9%. The prevalence of brugian filarial is higher in this group compared to those with indoor jobs (38.0% vs 23.5%, p = 0.015). The older age group was significantly associated with brugian filarial infection after adjusting for other factors (AOR 3.20; 95% CI 1.63, 6.32). Conclusion: The older adults (≥ 56-year-old), those who never involved in MDA and those with outdoor jobs are associated with lymphatic filariasis infection in Beluran.

Matched MeSH terms: Elephantiasis, Filarial
Association of CTLA4 gene polymorphisms with lymphatic filariasis in an East Malaysian population

Idris ZM, Miswan N, Muhi J, Mohd TA, Kun JF, Noordin R

Hum Immunol, 2011 Jul;72(7):607-12.
PMID: 21513760 DOI: 10.1016/j.humimm.2011.03.017

Lymphatic filariasis (LF) is a parasitic disease caused by threadlike worms of the Brugia and Wuchereria species that live in the human lymphatic system. Regulatory T cells (Tregs) may play a key role in the pathogenesis of LF, and cytotoxic T-lymphocyte antigen-4 (CTLA4) expressed by Tregs is a potential candidate gene because it modulates T-cell activation. A case-control study was performed to establish a potential association of 5 CTLA4 gene promoter single nucleotide polymorphisms (SNPs; rs733618, rs11571316, rs5742909, rs231775, and rs16840252) with the occurrence of LF in an East Malaysian population (320 LF-infected individuals and 150 healthy controls). Polymorphisms were evaluated using TaqMan real-time polymerase chain reaction followed by direct sequencing. LF carriers of the rs733618 AG genotypes (p = 0.02) and those with combined minor allele G carriers (AG + GG; p = 0.01) exhibited a significantly decreased risk for LF. Among the asymptomatic amicrofilaremic cases, positive associations were reported for all genotypes and variants of rs733618 with odds ratios (ORs) ranging from 0.27 to 0.45. In the asymptomatic microfilaremic cases, marker rs231775 exhibited a significant decreased risk, with ORs ranging from 0.50 to 0.57. The study has identified SNPs in the CTLA4 promoter gene that may be functionally linked with susceptibility to LF.

Matched MeSH terms: Elephantiasis, Filarial/genetics*
Biochemical studies in Presbytis cristata infected with subperiodic Brugia malayi

Choong MF, Mak JW

Trop. Med. Parasitol., 1991 Mar;42(1):71-2.
PMID: 1675809

The Presbytis cristata--Brugia malayi model, now established as a reliable non-human primate model for the experimental screening of potential filaricides, was monitored at monthly intervals for changes in the liver and renal function tests and also for alkaline phosphatase levels during infection. Animals infected with 200-400 infective larvae became patient at 50-90 days post-infection and geometric mean microfilarial counts were above 1000 per ml from the fourth month onwards. There were no significant changes in the biochemical parameters monitored throughout the period of observation. This is an important observation as any changes seen in these parameters during experimental drug studies can be attributed to drug reaction or toxicity and this will be invaluable in decision making as to drug safety.

Matched MeSH terms: Elephantiasis, Filarial/enzymology; Elephantiasis, Filarial/physiopathology*
Breeding-site productivity of the swamp forest mosquitoes Mansonia bonneae and Ma. dives in Sarawak, east Malaysia

Chang MS, Jute N, Lah J

Med Vet Entomol, 1988 Jan;2(1):19-28.
PMID: 2908782

Studies on larval population densities and adult emergence rates of the Brugian filariasis vectors Mansonia bonneae Edwards and Ma. dives Schiner were conducted in freshwater swamp forest bordering the Sadong River, Serian District, Sarawak, East Malaysia, during 1984-85. Three species of aquatic host-plants in the Family Araceae were identified as supporting immature stages of the Ma. bonneae/dives complex. Proportions of positive plants were 4.7%, 6.5% and 3.4% with 6.4 +/- 2.6, 7.3 +/- 2.8 and 10.1 +/- 1.1 larvae per positive plant, respectively, for the plant species Homalomena cordata Schott, H. rostrata Griffiths and Hydrostemma motleyi (Hook. f.) Mabberley. These data indicate no significant preferences between the three types of host-plant. Detailed monitoring of the host-plant H. cordata revealed no significant monthly fluctuations in larval density per plant nor the proportion of positive plants. 11.6% of larvae were Ma. dives and 88.4% were Ma. bonneae. Mean daily yields of Ma. bonneae/dives adults per square metre of H. cordata vegetated water surface were 0.45 males plus 0.57 females during the wet season (December-February) compared with 0.2 males plus 0.31 females during the dry season (June-August). Thus output of adults per plant was approximately halved, and suitable breeding areas were further reduced, during the dry season. By extrapolation from these rates, a crude mean estimate for productivity of Ma. bonneae/dives females is 1.6 million per hectare per annum in swamp forest habitats vegetated with any of the host-plants studied.

Matched MeSH terms: Elephantiasis, Filarial/transmission*
Fulltext Building country capacity to sustain NTD programs and progress: A call to action

Sodahlon Y, Ross DA, McPhillips-Tangum C, Lawrence J, Taylor R, McFarland DA, et al.

PLoS Negl Trop Dis, 2020 10;14(10):e0008565.
PMID: 33031387 DOI: 10.1371/journal.pntd.0008565
Matched MeSH terms: Elephantiasis, Filarial/drug therapy
Changes in complement C3 levels following treatment of patients with Brugia malayi infection

Yadav M

Southeast Asian J. Trop. Med. Public Health, 1989 Jun;20(2):183-7.
PMID: 2609207

Serum IgG levels and complement C3 levels were assayed on Day 0, 1, 3-4, 7 and 56-70 post-treatment with diethylcarbamizine citrate (DEC) in a series to 26 patients with Brugia malayi infection and 6 volunteers without infection. On treatment, the microfilariae were cleared from the blood within 24 hours. The eosinophils decreased dramatically on Day 1 post-treatment but increased rapidly by Day 4 to 7 and then dropped to normal levels in 45 days. The serum IgG mean levels decreased briefly following treatment with DEC but then returned to original levels. However, the complement C3 levels gradually increased over the 2 months period of study reaching statistical significance levels (p less than 0.01) in patients with initial high blood microfilariae. The observation suggests that Brugia malayi infection probably induces a high rate of synthesis of complement C3 and this process continued in the post-treatment phase. Since, DEC treatment did not cause a decrease in complement C3 with the elimination of blood microfilariae, it would appear that the complement C3 is consumed following antibody attachment to the microfilariae as they enter the blood circulation.

Matched MeSH terms: Elephantiasis, Filarial/blood; Elephantiasis, Filarial/drug therapy*; Elephantiasis, Filarial/immunology
Chemoprophylactic studies with ivermectin against subperiodic Brugia malayi infection in the leaf monkey, Presbytis cristata

Mak JW, Lam PL, Rain AN, Suresh K

J Helminthol, 1987 Dec;61(4):311-4.
PMID: 3437112

Four Presbytis cristata were treated with oral ivermectin at the same time as the subcutaneous inoculation of 100 infective larvae monthly for three months. Two animals given 0.2 mg/kg monthly and two others given 0.3 mg/kg monthly as well as three control animals became patent for microfilaraemia. However, only 1% of the infective dose was recovered as adult worms from animals in the higher drug dosage group compared to 8.2% and 6.2% in the lower dosage and control groups respectively.

Matched MeSH terms: Elephantiasis, Filarial/prevention & control*
Fulltext Colonization of Mansonia dives Schiner in a field insectary

Chang MS, Ho BC, Chan KL

Southeast Asian J. Trop. Med. Public Health, 1991 Jun;22(2):229-34.
PMID: 1683011

Successful colonization of Mansonia dives, the principal vector of subperiodic Brugia malayi was established in a field insectary. Mean egg clusters laid on Eichhornia crassipes, Pistia stratiotes, Homalomena cordata and polystyrofoam strips were 12.0, 10.4, 9.5 and 13.7 respectively. However, the mean number of first instar larvae hatched from each egg cluster laid by females on the three plant substrates (range 51.1 to 58.6) was higher than that laid on the polystyrofoam strips (41.8). There were no significant differences in the success pupation and adult emergence rates among the three host plants used as attachment substrates. Adult emergence occurred at a mean of 10.8 days. The first adult emergence was observed at the 25th day after hatching and continued till the 50th day. The 50% mortality rates for the adults were estimated as 8 days for the males and 14 days for the females. The mean gonotrophic cycle ranged from 3.8 to 4.3 days with a mean of 4.04 days. 63.6% of Ma. dives females oviposited in a medium of rat dung and water. The mean incubation period of eggs ranged from 5.2 to 6.5 days with a mean of 5.7 days. The biology of Ma. dives and Ma. bonneae is briefly compared.

Matched MeSH terms: Elephantiasis, Filarial/transmission
Comparison of IgG4 assays using whole parasite extract and BmR1 recombinant antigen in determining antibody prevalence in brugian filariasis

Noordin R, Wahyuni S, Mangali A, Huat LB, Yazdanbakhsh M, Sartono E

Filaria journal, 2004 Aug 12;3(1):8.
PMID: 15307892

BACKGROUND: Brugia malayi is endemic in several Asian countries with the highest prevalence in Indonesia. Determination of prevalence of lymphatic filariasis by serology has been performed by various investigators using different kinds of antigen (either soluble worm antigen preparations or recombinant antigens). This investigation compared the data obtained from IgG4 assays using two different kinds of antigen in a study on prevalence of antibodies to B. malayi. METHODS: Serum samples from a transmigrant population and life long residents previously tested with IgG4 assay using soluble worm antigen (SWA-ELISA), were retested with an IgG4 assay that employs BmR1 recombinant antigen (BmR1 dipstick [Brugia Rapid trade mark ]). The results obtained with the two antigens were compared, using Pearson chi-square and McNemar test. RESULTS: There were similarities and differences in the results obtained using the two kinds of antigen (SWA and BmR1). Similarities included the observation that assays using both antigens demonstrated an increasing prevalence of IgG4 antibodies in the transmigrant population with increasing exposure to the infection, and by six years living in the area, antibody prevalence was similar to that of life-long residents. With regards to differences, of significance is the demonstration of similar antibody prevalence in adults and children by BmR1 dipstick whereas by SWA-ELISA the antibody prevalence in adults was higher than in children. CONCLUSIONS: Results and conclusions made from investigations of prevalence of anti-filarial IgG4 antibody in a population would be affected by the assay employed in the study.

Matched MeSH terms: Elephantiasis, Filarial

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