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Use of antifilarial IgG4-ELISA to detect Brugia malayi infection in an endemic area of Malaysia

Rahmah N, Anuar AK, Ariff RH, Zurainee MN, A'shikin AN, Fadzillah A, et al.

Trop Med Int Health, 1998 Mar;3(3):184-8.
PMID: 9593356

OBJECTIVE: To evaluate the usefulness of antifilarial IgG4 antibody assay in detecting B. malayi infection in a filaria endemic area in Malaysia.
METHODS: A sandwich ELISA using B. malayi soluble antigen was employed to detect antifilarial IgG4 antibodies in serum samples of 330 individuals who comprised 88 healthy individuals from nonendemic areas, 15 B. malayi microfilaraemic cases, 22 individuals with soil-transmitted helminthiases, 9 elephantiasis cases and 196 residents from a B. malayi-endemic area. An O.D. value of > 0.420 at serum dilution of 1:400 was used as the cut-off point. This cut-off point was obtained by taking the mean optical density (0.252 + 4 S.E.) of 36 negative sera which had O.D. values greater than 0.1 at serum dilution of 1:400.
RESULTS: All 15 microfilaraemic persons were positive for antifilarial IgG4 antibody. Non-endemic normals, soil-transmitted helminth infected persons and chronic elephantiasis cases were negative for antifilarial IgG4 antibody. Of the 196 individuals from the filaria endemic area, 37 (18.8%) demonstrated presence of antifilarial IgG4 antibodies; and only eight individuals (4.1%) were positive for microfilariae. All eight microfilaraemic individuals were also positive for antifilarial IgG4 antibodies.
CONCLUSION: Antifilarial IgG4-ELISA could detect 4.6 times more positive cases than the microfilaria detection method. With appropriate cut-off values that eliminate cross-reactivities, this serological tool is very useful for Brugia malayi prevalence surveys and diagnosis.

Matched MeSH terms: Brugia malayi/immunology*; Brugia malayi/isolation & purification*
Two microsatellite loci from Brugia malayi show polymorphisms among isolates from Indonesia and Malaysia

Underwood AP, Supali T, Wu Y, Bianco AE

Mol Biochem Parasitol, 2000 Mar 05;106(2):299-302.
PMID: 10699259
Matched MeSH terms: Brugia malayi/genetics*; Brugia malayi/isolation & purification
Specificity and sensitivity of a rapid dipstick test (Brugia Rapid) in the detection of Brugia malayi infection

Rahmah N, Taniawati S, Shenoy RK, Lim BH, Kumaraswami V, Anuar AK, et al.

Trans R Soc Trop Med Hyg, 2002 1 31;95(6):601-4.
PMID: 11816429

A total of 753 serum samples from 6 institutions in 3 countries (Malaysia, Indonesia and India) were used to evaluate an immunochromatographic rapid dipstick test, Brugia Rapid, for diagnosis of Brugia malayi infection. The samples comprised sera from 207 microfilaria-positive individuals and 546 individuals from filaria non-endemic areas. The latter consisted of 70 individuals with soil-transmitted helminth infections, 68 with other helminth infections, 238 with protozoan infections, 12 with bacterial and viral infections and 158 healthy individuals. The dipstick is prepared with a goat anti-mouse antibody control line and a B. malayi recombinant-antigen test line. First, the dipstick is dipped into a well containing diluted patient serum, thus allowing specific anti-filarial antibody in the serum to react with the recombinant antigen. Then the dipstick is placed into an adjacent well containing reconstituted anti-human IgG4-gold. After 10 min, development of 2 red-purplish lines denotes a positive result and one line indicates a negative reaction. The overall results of the evaluation showed 97% sensitivity, 99% specificity, 97% positive predictive value and 99% negative predictive value. Brugia Rapid is thus a promising diagnostic tool for detection of B. malayi infection, and would be especially useful for the brugian filariasis elimination programme.

Matched MeSH terms: Brugia malayi/immunology; Brugia malayi/isolation & purification*
The use of monoclonal antibodies in the detection of circulating antigens in Malayan filariasis

Soeyoko SS

Southeast Asian J. Trop. Med. Public Health, 1993;24 Suppl 2:23-5.
PMID: 7973941

Wuchereria bancrofti, Brugia malayi and Brugia timori are the causative agents of lymphatic filariasis in Indonesia but in some endemic areas, B malayi is more commonly found. Diagnosis of filariasis is normally based on clinical, parasitological and immunological examinations but those methods have limitations. The discovery of monoclonal antibodies is expected to provide a new dimension to the efforts in the development of specific and sensitive immunological tests for the various stages of filariasis infection. This preliminary report, using monoclonal antibodies and dot-blot assay in human lymphatic filariasis showed that 75% of sera from microfilaremic patients with clinical signs, 40% of sera from amicrofilaraemic patients with clinical signs, 88.8% of sera from microfilaremic patients without clinical signs and 19.6% of sera from amicrofilaremic patients without clinical signs have circulating antigens.

Matched MeSH terms: Brugia malayi/immunology; Brugia malayi/isolation & purification*
Purification of BmR1 recombinant protein

Arifin N, Basuni M, Lan CA, Yahya AR, Noordin R

Protein J, 2010 Oct;29(7):509-15.
PMID: 20845068 DOI: 10.1007/s10930-010-9281-1

This paper describes a refinement in the purification step that facilitated the downstream recovery of high purity BmR1 recombinant protein, which is a protein used as a test reagent in the commercialized rapid tests for detection of lymphac filariasis i.e. Brugia Rapid™ and panLF rapid™. Purification was performed by immobilized metal affinity chromatography (IMAC), followed by ion exchange chromatography (IEX). Results showed that a total of 10.27 mg of BmR1 was obtained when IMAC was performed using 20 mM of imidazole and 5 column volume of wash buffer containing 500 mM of NaCl. Purity of the target protein was enhanced when buffer at pH 5.8 was used during the IEX. Two proteins that recurrently appeared below the BmR1 recombinant protein were identified by mass-spectrometry analysis as the same protein, thus they were probably degradation products of BmR1. These strategies improve purity of the target protein to be used in applications such as production of aptamers and monoclonal antibodies.

Matched MeSH terms: Brugia malayi/genetics; Brugia malayi/metabolism
Applicability of Brugia malayi immune antibody library for the isolation of a human recombinant monoclonal antibody to Echinococcus granulosus antigen B

Rahumatullah A, Ahmad A, Noordin R, Lai JY, Baharudeen Z, Lim TS

Exp Parasitol, 2020 Dec;219:108029.
PMID: 33096112 DOI: 10.1016/j.exppara.2020.108029

Echinococcus granulosus is a worldwide zoonotic infection that causes human cystic echinococcosis (CE) or hydatid disease. The present study describes the isolation and production of a monoclonal antibody against recombinant AgB protein using the developed Human AntibodY Disease ENhanced (HAYDEN)-Filariasis library. The DNA sequences of the isolated clones were analyzed, followed by gene analysis and binding assays. Clone E1 showed a full-length sequence and represents the IgHV5-LV3 antibody gene family. The antibody protein yield was satisfactory, and it reacted specifically against rAgB. The novel E1 protein is potentially useful for the development of an antigen detection assay for CE. The ability of the Brugia malayi immune antibody library to isolate antibodies against Echinococcus granulosus antigens highlights the broad coverage of immune antibody libraries.

Matched MeSH terms: Brugia malayi/genetics; Brugia malayi/immunology*
Simple blood-spot sampling with nested polymerase chain reaction detection for epidemiology studies on Brugia malayi

Cox-Singh J, Pomrehn AS, Rahman HA, Zakaria R, Miller AO, Singh B

Int J Parasitol, 1999 May;29(5):717-21.
PMID: 10404266

In the absence of a suitable Brugia malayi antigen detection assay, PCR remains one of the more sensitive alternatives to Giemsa-stained thick blood films for B. malayi detection. The need for refrigerated storage and transportation of blood has limited the use of PCR for large-scale epidemiology studies in remote endemic areas. Here we report simple finger-prick blood-spot collection, a one-tube DNA template extraction method and the development of a B. malayi-specific nested PCR assay. The assay was tested on 145 field samples and was positive for all 30 microscopy-positive samples and for an additional 13 samples which were microscopy-negative.

Matched MeSH terms: Brugia malayi/genetics; Brugia malayi/isolation & purification*
Multicentre laboratory evaluation of Brugia Rapid dipstick test for detection of brugian filariasis

Rahmah N, Shenoy RK, Nutman TB, Weiss N, Gilmour K, Maizels RM, et al.

Trop Med Int Health, 2003 Oct;8(10):895-900.
PMID: 14516300

A multicentre evaluation of the Brugia Rapid dipstick test was performed using 1263 serum samples in four international laboratories, i.e. T.D. Medical College (TDMC, India), National Institutes of Health (NIH, USA), Swiss Tropical Institute (STI, Switzerland) and Leiden University Medical Centre (LUMC, Netherlands). In comparison with microscopy, the dipstick demonstrated sensitivities of 97.2% (70 of 72) at TDMC, 91.6% (175 of 191) at LUMC and 100% (six of six) at STI. Sera of chronic patients showed a positivity rate of 11.3% (19 of 168) and 61.2% (71of 116) at TDMC and LUMC, respectively. All 266 sera of non-endemic normals from STI, NIH and LUMC tested negative with the dipstick. At LUMC, sera of 'endemic normals' (amicrofilaraemics with no clinical disease) from an area with approximately 35% microfilaria positivity showed 60.8% positive results (31 of 51), thus demonstrating the likelihood of many cryptic infections occurring in this population. Specificities of the test with Onchocerca volvulus sera were 98.8% (80 of 81) and 100% (10 of 10) at the NIH and STI, respectively; while specificity with Loa loa sera at the NIH was 84.6% (44 of 52). At the STI, the dipstick test also demonstrated 100% specificity when tested with 75 sera from various protozoan and helminthic infections.

Matched MeSH terms: Brugia malayi/immunology; Brugia malayi/isolation & purification*
Short communication: use of a recombinant antigen-based ELISA to determine prevalence of brugian filariasis among Malaysian schoolchildren near Pasir Mas, Kelantan-Thailand border

Rahmah N, Lim BH, Azian H, Ramelah TS, Rohana AR

Trop Med Int Health, 2003 Feb;8(2):158-63.
PMID: 12581442

Brugian filariasis infects 13 million people in Asia. The routine prevalence survey method using night thick blood smear is not sensitive enough to reflect the actual infection prevalence. In 1997-2001, only three microfilaraemic cases (of 5601 individuals screened; 0.05%) were reported in Pasir Mas, a district in Kelantan (Malaysia), which shares a border with Thailand. We therefore investigated the infection prevalence in this district by employing a sensitive and specific serological assay (Brugia-Elisa). This test is based on detection of specific IgG4 antibody against a Brugia malayi recombinant antigen. A total of 5138 children, aged 7-12 years, from 16 primary schools, were tested. Eighteen pupils in eight schools, located in five subdistricts, tested positive, giving an overall prevalence rate of 0.35%. Infection in these children is significant as they represent more recent cases. These subdistricts should be included in the national filariasis elimination programme.

Matched MeSH terms: Brugia malayi/immunology; Brugia malayi/isolation & purification*
Brugia malayi infection in Meriones unguiculatus: antibody response to recombinant BmR1

Lim BH, Noordin R, Nor ZM, Rahman RA, Abdullah KA, Sinnadurai S

Exp Parasitol, 2004 Sep-Oct;108(1-2):1-6.
PMID: 15491542

BmR1 recombinant antigen has previously been shown to demonstrate high sensitivity and specificity in the serological diagnosis of brugian filariasis in humans. In this study, the pattern of recognition of antibody to BmR1 during Brugia malayi infection was investigated by employing Meriones unguiculatus as the experimental model. Thirty two gerbils were infected subcutaneously with 120 L(3); and two control groups each comprising 25 animals were employed. ELISA using BmR1 was used to detect filaria-specific IgG antibodies elicited by the gerbils; using sera collected from the day 1 until day 150 post-inoculation (p.i.). The results showed that BmR1 detected B. malayi infection in gerbils harboring adult worms irrespective of the presence of circulating microfilaria, and was exemplified by positive ELISA results in nine a microfilaraemic animals that harbored live adult worms. The initial time of the antibody recognition was at day 8 p.i. and the antibody titre showed some correlation with adult worm burden.

Matched MeSH terms: Brugia malayi/growth & development; Brugia malayi/immunology*; Brugia malayi/isolation & purification
Fulltext Ten-year analysis of Filariasis in east-coast Malaysia

Ahmad Syaify B., Alamin M. D., Norafidah A. R.

Malaysian Journal of Medicine and Health Sciences, 2019;15(106):83-83.
MyJurnal

Introduction:Lymphatic filariasis (LF) is a neglected tropical disease that can cause significant morbidity. In Malay-sia, National Programme for the Elimination of Lymphatic Filariasis started in 2001 with the initial target of achiev-ing Lymphatic Filariasis elimination status by 2018 but it has been revised to year 2020. Mass Drug Administration (MDA) Programme was performed from 2004 to 2008 in all endemic areas (Red Implementation Unit, IU) in Malay-sia including Terengganu state to stop disease transmission. Transmission Assessment Surveys (TAS) were conducted later on and for Terengganu, they were done in 2011 (TAS 1), 2015 (TAS 2) and 2017 (TAS 3) and had passed all the surveys based on critical cut off (CCO) point given. Methods: A cross sectional analysis of 10-year Terengganu filariasis records (2009-2018) was initiated in June 2019 using data source from eVekpro and filariasis cases line-list-ing. Results: Majority of filariasis cases in Terengganu were among males (n=147, 76.6%) with the highest number among 30-39 year-old age group (n=35, 18.2%). Majority of cases were Malaysian citizens (n=162, 84.4%) with main filariasis species identified were Brugia Malayi (n=149, 77.6%). The number of cases diagnosed was slightly higher from Green Implementation Unit area (n=102, 53.1%) compared to Red Implementation Unit area. Conclu-sion: The number of lymphatic filariasis cases among Terengganu citizens was below critical cut off point after the accomplishment of MDA programme and in accordance with the aim of lymphatic filariasis elimination status in Malaysia by 2020.

Matched MeSH terms: Brugia malayi
Fulltext The epidemiology and treatment of infection due to Brugia malayi

Edeson JFB

Bull World Health Organ, 1962;27(4-5):529-41.
PMID: 20604131

The author reviews the distribution, epidemiology, and treatment of filarial infection due to Brugia malayi, with special reference to Malaya. B. malayi infection in man is confined to the Far East between longitudes 75 degrees E and 140 degrees E and is essentially rural. The chief vectors are Mansonia spp., Anopheles hyrcanus group, A. barbirostris group, and Aëdes togoi. The epidemiological picture is complicated by the fact that B. malayi and other closely related species have now been found in several species of animals. The existence of an animal reservoir of infection might have important implications for filariasis control. As to the treatment of B. malayi infection, diethylcarbamazine has been found to reduce the microfilaria count and to kill the adult worms; the severe febrile reactions of microfilaria carriers to the initial doses of this drug may be reduced by administration of the steroid prednisolone.

Matched MeSH terms: Brugia malayi
The periodicity of the microfilariae of Brugia malayi in Cheju Island, Korea

Seo BS

Kisaengchunghak Chapchi, 1974 Dec;12(2):95-100.
PMID: 12913470

The periodicity of the microfilariae of Brugia malayi was studied in 9 human carriers from Shin-san Ri, Seong-san Myon, Cheju Island. The periodicity pattern was markedly nocturnal and the peaks were observed between 21:30 p.m. and 5:30 a.m. The average peak count was 1:30 a.m. and the percentage of peak count at this time was 95.3. The ratio of minimum of the average peak count percentage to the maximum was 8.3. The periodicity pattern of B.malayi in Cheju Island was compared with that in Inland and no differences were found between two forms. From the above observations, it was concluded that the periodicity of B. malayi in Korea is markedly nocturnal and closely resembles that in the strain of Penang, Malaya.

Matched MeSH terms: Brugia malayi
Parasitological and serological investigation into lymphatic filariasis among immigrant at Semenyih Detention Centre, Selangor, West Malaysia

Wan Omar A, Khairul Anuar A, Sulaiman O, Rahmah N, Manaf A, Rahimah A

JUMMEC, 2000;5:41-44.

Parasitological and serological investigations for lymphatic filariasis were performed on 450 immigrants detained at the lmmigration Centre at Semenyih, Selangor, West Malaysia. The country of origin of these immigrants were Indonesia, The Philippines, Myanmar, Bangladesh, India and Pakistan. Brugia malayi adult worm homogenate (BmAH) antigen was used for the detection of antiifilarial IgG. A monoclonal antibody-based ELISA (MAb.XC3-ELISA) specific for filarial circulating antigens and non-phosphorylcholine reactive was used to detect antigenemia in these immigrants. Parasitologically 67 (14.89 %) were positive for W. bancrofti and 54 (12.0%) for Brugia malayi. Serologically 63% had antifilarial IgG titre to the BmAH antigen. While Bancroftian filariasis is now unknown in Peninsular Malaysia, the potential of it to be reintroduced into Peninsular Malaysia by the immigrant population is discussed. KEYWORDS: Lymphatic filariasis, immigratits, antifilarial IgG, antigenemia

Matched MeSH terms: Brugia malayi
Detection of human filarial parasite Brugia malayi in dogs by histochemical staining and molecular techniques

Ambily VR, Pillai UN, Arun R, Pramod S, Jayakumar KM

Vet Parasitol, 2011 Sep 27;181(2-4):210-4.
PMID: 21620569 DOI: 10.1016/j.vetpar.2011.04.041

Human filariasis caused by Brugia malayi is still a public health problem in many countries of Asia including India, Indonesia, Malaysia and Thailand. The World Health Organization (WHO) has targeted to eliminate filariasis by the year 2020 by Mass annual single dose Diethylcarbamazine Administration (MDA). Results of the MDA programme after the first phase was less satisfactory than expected. Malayan filariasis caused by B. malayi is endemic in the south of Thailand where domestic cat serves as the major reservoir host. There is no report about the occurrence of B. malayi in dogs. The present work was carried out to find out the incidence of microfilariasis in dogs and also to detect the presence of human filarial infection in dogs, if any. One hundred dogs above 6 months of age presented to the veterinary college Hospital, Mannuthy, Kerala, with clinical signs suggestive of microfilariasis - fever, anorexia, conjunctivitis, limb and scrotal oedema - were screened for microfilariae by wet film examination. Positive cases were subjected to Giemsa staining, histochemical staining and molecular techniques. Results of the study showed that 80% of dogs had microfilariasis; out of which 20% had sheathed microfilaria. Giemsa and histochemical staining character, PCR and sequencing confirmed it as B. malayi. High prevalence of B. malayi in dogs in this study emphasized the possible role of dogs in transmission of human filariasis.

Matched MeSH terms: Brugia malayi/isolation & purification*
Fulltext Eye lesion caused by adult Brugia malayi: a first case reported in a child from Malaysia

Rohela M, Jamaiah I, Yaw CC

Southeast Asian J. Trop. Med. Public Health, 2006 Jul;37(4):652-5.
PMID: 17121289

We are reporting a case of an eye lesion caused by an adult Brugia malayi. The patient was a 3-year-old Chinese boy from Kemaman District, Terengganu, Peninsular Malaysia. He presented with a one week history of redness and palpebral swelling of his right eye. He claimed that he could see a worm in his right eye beneath the conjunctiva. He had no history of traveling overseas and the family kept dogs at home. He was referred from Kemaman Hospital to the eye clinic of Hospital Tengku Ampuan Afzan, Kuantan, Pahang, Malaysia. On examination by the ophthalmologist, he was found to have a subconjunctival worm in his right eye. Full blood count revealed eosinophilia (10%). Four worm fragments, each about 1 cm long were removed from his right eye under general anesthesia. A thick blood smear stained with Giemsa was positive for microfilariae of Brugia malayi. A Brugia Rapid test done was positive. He was treated with diethylcarbamazine.

Study site: Opthamolagy clinic, Hospital Tengku Ampuan Afzan

Matched MeSH terms: Brugia malayi*
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: Brugia malayi/immunology*
Fulltext Comparison of Brugia-Elisa and thick blood smear examination in a prevalence study of brugian filariasis in Setiu, Terengganu, Malaysia

Lim BH, Rahmah N, Afifi SAB, Ramli A, Mehdi R

Med J Malaysia, 2001 Dec;56(4):491-6.
PMID: 12014770

A total of 1,134 finger-pricked blood samples were collected from residents of Setiu, Terengganu. A drop of blood was used to make thick blood smear and about four drops were used for obtaining serum. The smears were stained and examined by the State Vector Control Unit in Kuala Terengganu, while the serum samples were tested for specific IgG4 antibodies to a novel recombinant antigen using Brugia-Elisa. Prevalence of filariasis in these areas were found to be 0.26% (3/1,134) using thick blood smear examination and 2.47% (28/1,134) using Brugia-Elisa, thus demonstrating the greater sensitivity of the latter test. In addtion, Brugia-Elisa showed a high level of specificity (97.8%, 1,106/1,131) when compared to thick blood smear examination.

Matched MeSH terms: Brugia malayi/isolation & purification*
PCR-ELISA for the detection of Brugia malayi infection using finger-prick blood

Rahmah N, Ashikin AN, Anuar AK, Ariff RH, Abdullah B, Chan GT, et al.

Trans R Soc Trop Med Hyg, 1998 12 16;92(4):404-6.
PMID: 9850392

A polymerase chain reaction assay based on the enzyme-linked immunosorbent assay (PCR-ELISA) has been developed to detect Brugia malayi infection in an area of low endemicity in Malaysia. Blood samples from 239 subjects were tested: 192 amicrofilaraemic individuals, 14 microfilaraemic persons and 3 chronic elephantiasis cases from endemic areas and 30 city-dwellers (non-endemic controls). PCR products were examined by ELISA and Southern hybridization. In the PCR-ELISA, digoxigenin-labelled PCR products were hybridized to a biotin-labelled probe. This was followed by incubation in streptavidin-coated microtitre wells and detection using anti-digoxigenin-peroxidase and ABTS [2,2'-azinobis(3-ethylbenzthiazoline-6-sulphonic acid)]. All microfilaraemic samples were positive by PCR-ELISA and Southern hybridization and all samples from non-endemic subjects and chronic elephantiasis patients were negative. The PCR-ELISA detected 12 times as many B. malayi infections as did thick blood film examination. Nineteen of the 194 samples from the endemic area gave positive results by both PCR-ELISA and Southern hybridization, and an additional 5 samples were positive by PCR-ELISA only. The PCR-ELISA was specific and sensitive, detected more infections, and was more reproducible than Southern hybridization.

Matched MeSH terms: Brugia malayi/isolation & purification*
Current status of filariasis in Malaysia

Marzhuki MI, Tham AS, Poovaneswari S

Southeast Asian J. Trop. Med. Public Health, 1993;24 Suppl 2:10-4.
PMID: 7973937

The Filariasis Control Program was established more than 30 years ago in the country and the disease is still a public health problem in some states. Since 1983, a total of 17 filariasis control teams were formed throughout the country to carry out filariasis control work. The teams conduct house and population censuses, nocturnal mass blood surveys and treatment of microscopically confirmed cases. Individual case follow-up is being carried out after 3-5 months while the locality is resurveyed after about 2-3 years. During the years 1988 to 1990, there appeared to be a decreasing trend in the number of filariasis cases detected countrywide. In 1991, brugian filariasis accounted for 92% of the cases detected. The microfilaria rate (MFR) also showed a decreasing trend countrywide for the years 1988 (0.57%) to 1990 (0.35%) but there was an increase in 1991 although it remained well below the 5% MFR targeted in the program objective, In 1991, the filariasis control teams and the district multi-purpose teams collected a total of 167, 151 blood slides out of which 871 were found to be positive for microfilaria. To determine the true endemicity of filariasis in the country, the malaria district multi-purpose teams are also utilized to assist in probe surveys in new areas of the district. Two species of filarial worms, namely Brugia malayi and Wuchereria bancrofti, and the mosquito vectors belonging to the Anopheles and Mansonia genera are involved in the transmission of filariasis in Malaysia. Monkeys and domestic cats are the reservoir hosts for the subperiodic strain of B. malayi.

Matched MeSH terms: Brugia malayi/physiology

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