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  1. Fulltext A Review on the Prevalence of Toxoplasma gondii in Humans and Animals Reported in Malaysia from 2008-2018
    Nasiru Wana M, Mohd Moklas MA, Watanabe M, Nordin N, Zasmy Unyah N, Alhassan Abdullahi S, et al.
    Int J Environ Res Public Health, 2020 07 03;17(13).
    PMID: 32635389 DOI: 10.3390/ijerph17134809
    Toxoplasmosis is a disease caused by the protozoan parasite Toxoplasma gondii (T. gondii). Human toxoplasmosis seroprevalence in Malaysia has increased since it was first reported in 1973 as shown in previous reviews of 1991 and 2007. However, over a decade since the last review, comprehensive data on toxoplasmosis in Malaysia is lacking. This work aimed at reviewing articles on toxoplasmosis research in Malaysia in order to identify the research gaps, create public awareness, and efforts made so far and proffer management options on the disease. The present review examines the available published research articles from 2008 to 2018 related to toxoplasmosis research conducted in Malaysia. The articles reviewed were retrieved from nine credible databases such as Web of Science, Google Scholar, ScienceDirect, PubMed, Scopus, Springer, Wiley online library, Ovid, and Cochrane using the keywords; Malaysia, toxoplasmosis, Toxoplasma gondii, toxoplasma encephalitis, seroprevalence, human immunodeficiency virus (HIV) patients, pregnant women, genotype strain, anti-toxoplasma antibodies, felines, and vaccine. The data highlighted seropositive cases from healthy community members in Pangkor Island (59.7%) and among migrant workers (57.4%) at alarming rates, as well as 42.5% in pregnant women. Data on animal seroprevalence were limited and there was no information on cats as the definitive host. Genetic characterization of Toxoplasma gondii from HIV patients; pregnant women, and domestic cats is lacking. This present review on toxoplasmosis is beneficial to researchers, health workers, animal health professionals, and policymakers. Therefore, attention is required to educate and enlighten health workers and the general public about the risk factors associated with T. gondii infection in Malaysia.
    Matched MeSH terms: Toxoplasmosis/epidemiology*; Toxoplasmosis, Animal/epidemiology*
  2. Fulltext A Toxoplasma gondii 10 kDa in vitro excretory secretory antigen reactive with human IgM and IgA antibodies
    Saadatnia G, Ghaffarifar F, Khalilpour A, Amerizadeh A, Rahmah N
    Trop Biomed, 2011 Dec;28(3):606-14.
    PMID: 22433890 MyJurnal
    Toxoplasmosis can cause serious disease in immunocompromised patients and to congenitally infected foetuses. Appropriate laboratory investigations in potential cases of acute Toxoplasma infection are important. Excretory secretory antigen (ESA) is immunogenic during both human and experimental infections, therefore is considered as a good candidate for investigation into new infection markers. In this study, ESA was prepared from in vitro cultures of Toxoplasma gondii to identify T. gondii ESA antigenic component(s) that is/are most reactive with serum samples from probable acute cases of toxoplasmosis. Serum samples were obtained from several categories of individuals with the following Toxoplasma serology: Group I: IgM+ IgG+ (low IgG avidity) or IgM+ IgG- from sera of patients who had clinical query of toxoplasmosis (n=35). Group II: IgM- IgG+ (high IgG avidity) from chronically infected individuals (n=30). Group III: normal/healthy individuals with anti-Toxoplasma IgMIgG- (n=20). Group IV: individuals with other infections who had anti-Toxoplasma IgM- IgG- (n=10). The ESA was subjected to SDS-PAGE, followed by Western blot analysis using the above sera and probed with peroxidase conjugated anti-human IgM and IgA antibodies. The blots were then developed using chemiluminescence substrate. The selected antigenic band was excised from the gel after two dimensional electrophoresis and sent for mass spectrometry analysis using MALDI TOF-TOF. The most promising antigenic band was a 10 kDa protein which showed sensitivity of 80% in both IgM and IgA blots, and specificity of 96.7% with sera from other infections and healthy controls. The two best identifications for the 10 kDa band were ubiquitin (ribosomal protein CEP52 fusion protein) and polyubiquitin.
    Matched MeSH terms: Toxoplasmosis/diagnosis*
  3. Fulltext A community-based survey of Toxoplasma gondii infection among pregnant women in rural areas of Taiz governorate, Yemen: the risk of waterborne transmission
    Mahdy MA, Alareqi LM, Abdul-Ghani R, Al-Eryani SM, Al-Mikhlafy AA, Al-Mekhlafi AM, et al.
    Infect Dis Poverty, 2017 Feb 13;6(1):26.
    PMID: 28190399 DOI: 10.1186/s40249-017-0243-0
    BACKGROUND: Toxoplasma gondii is a zoonotic coccidian parasite causing morbidity and mortality. In Yemen, T. gondii infection has been reported among pregnant women seeking healthcare in the main cities. However, no data are available on the prevalence of T. gondii infection and its associated risk factors among pregnant women in the rural communities of the country. Thus, the present study aimed to determine the seroprevalence of T. gondii and identify its risk factors among pregnant women in the rural communities of Taiz governorate, Yemen.

    METHODS: A total of 359 pregnant women living in the rural communities of Taiz governorate were enrolled in this study by house-to-house visits. Data were collected using a pre-designed questionnaire, and blood samples were collected and tested for the detection of anti- T. gondii IgM and IgG antibodies by enzyme-linked immunosorbent assay.

    RESULTS: The prevalence of T. gondii infection among pregnant women in this study was 46.2% (166/359). Bivariate analysis identified the age of  ≥ 30 years (odds ratio [OR] = 1.7; 95% confidence interval [CI] = 1.09-2.65, P = 0.019) and unimproved water sources (OR = 2.2; 95% CI = 1.10-4.55, P = 0.023) as factors associated with T. gondii infection among pregnant women. The multivariable analysis, however, identified unimproved water sources as an independent risk factor (adjusted OR = 2.4; 95% CI = 1.16-5.0, P = 0.018) associated with T. gondii infection among pregnant women.

    CONCLUSIONS: Pregnant women in the rural communities of Taiz, Yemen are at high risk of contracting T. gondii infection. Unimproved water sources (wells, water streams and water tanks) are significantly associated with T. gondii infection and should be considered in prevention and control strategies, especially among pregnant women.

    Matched MeSH terms: Toxoplasmosis/epidemiology*; Toxoplasmosis/parasitology; Toxoplasmosis/prevention & control; Toxoplasmosis/transmission*
  4. A study on the prevalence of antibodies to Toxoplasma gondii in Singapore
    Lim KC, Pillai R, Singh M
    Southeast Asian J. Trop. Med. Public Health, 1982 Dec;13(4):547-50.
    PMID: 6763354
    The indirect fluorescence antibody technique has been employed to study the prevalence of toxoplasma antibodies in Singapore. 42.5% of clinically suspected cases of toxoplasmosis showed antibody titres. Of these, 17.5% had titres greater than or equal to 1.64. Malays and Indians have higher positive rates compared to the main ethnic group, the Chinese. Antibody titres are found in both males and females and span through the various age groups. The possible mode of transmission is discussed and the importance of congenital toxoplasmosis is indicated.
    Matched MeSH terms: Toxoplasmosis/diagnosis; Toxoplasmosis/immunology; Toxoplasmosis/epidemiology*
  5. A survey on the prevalence of toxoplasmic antibodies in animal sera
    Singh M, Zaman V, Goh TK, Kheng CS
    Med J Malaya, 1967 Dec;22(2):115-7.
    PMID: 4231976
    Matched MeSH terms: Toxoplasmosis, Animal/immunology*
  6. Fulltext AIDS-related opportunistic infections in Hospital Kuala Lumpur
    Nissapatorn V, Lee C, Quek KF, Abdullah KA
    Jpn J Infect Dis, 2003 Oct-Dec;56(5-6):187-92.
    PMID: 14695428
    We retrospectively reviewed 419 HIV/AIDS patients in Hospital Kuala Lumpur from 1994 to 2001. In the male group, the age range was 20-74, with a mean age 37 years, while in the female group it was 17-63, with a mean age of 33 years. With regard to age group, it was found that the preponderant age group was 25-34 years. The majority of male subjects were Chinese (52.5%), single (56.3%), and unemployed (55.1%), whereas the females were Malay (42.3%), married (79.5%), and non-laborer (64.1%). Also, both groups resided in Kuala Lumpur and had heterosexual contact as the leading cause of HIV transmission. More than half of the patients had CD4 cell counts of <200 cells/cumm. We found that the acquisition of HIV infection via intravenous drug use (IDU) was directly related to the incidence of tuberculosis infection (P < 0.05). Further analysis showed HIV-related tuberculosis with IDU was also dependently correlated with occupational status (unemployed) (P < 0.05). The four main AIDS-defining diseases include tuberculosis (48%), Pneumocystis carinii pneumonia (13%), toxoplasmic encephalitis (11%), and cryptococcal meningitis (7%); in addition, 53% of these patients were found to have CD4 cell counts of less than 200 cells/cumm at the time of diagnosis.
    Matched MeSH terms: Toxoplasmosis, Cerebral/epidemiology
  7. Acquired toxoplasmosis in Malaysia
    Leong AS, Wang F, Thomas V, Ong TH
    Southeast Asian J. Trop. Med. Public Health, 1976 Mar;7(1):10-5.
    PMID: 1027097
    Two cases of acquired toxoplasmosis in asymptomatic Malaysian patients are described. In both instances the diagnosis was first made on the finding of the Piringer-Kuchinka reaction in excised lymph nodes from these patients and serological studies further confirmed the presence of hihg toxoplasmic antibody titres. The characteristic histological features of toxoplasmic lymphadenitis are discussed. Diagnosis and management of the disease are briefly reviewed with emphasis that the importance of diagnosing this disease goes beyond the establishment of a mostly self-limiting, clinically unimportant protozoan infection.
    Matched MeSH terms: Toxoplasmosis/diagnosis; Toxoplasmosis/epidemiology*
  8. Advances in research on schistosomiasis and toxoplasmosis in China: A bibliometric analysis of Chinese academic journals published from 1980 to 2021
    Tao Y, Shen C, Zhang Y, Zhao X, Leow CY, Wu J, et al.
    Acta Trop, 2023 Feb;238:106783.
    PMID: 36455636 DOI: 10.1016/j.actatropica.2022.106783
    BACKGROUND: The scale-up of zoonoses prevention control and eradication in China, coupled with numerous academic articles in Chinese journals has led to the development of new tools and strategies aimed at further consolidating parasite control goals. As a result, there is a growing need for an up-to-date understanding of the research progress and prevention and control experience of parasitic diseases in China.

    METHODS: To understand the research status of schistosomiasis and toxoplasmosis in China, academic articles published in Chinese journals from 1980 to 2021 were retrieved from China National Knowledge Infrastructure (CNKI) and Wanfang databases. The Bibliographic Items Co-occurrence Matrix Builder (BICOMB) software was used to extract and analyze the keyword frequencies. The 'K/A ratio' as the frequency of a keyword that occurred in all the articles within a certain time stage was calculated to compare the popularity of the same keyword in different time stages. Keyword co-occurrence network maps were constructed by VOSviewer software.

    RESULTS: A total of 18,508 articles in the research field of Schistosoma and 13,289 articles in the field of Toxoplasma gondii were included. Results in both fields showed some similarities: the annual number of articles presented an increasing trend before entering the 21st century and decreased rapidly in recent years. Two opposite changing trends of keyword frequency could be observed in the K/A ratio analysis: the K/A ratios of 'Surveillance' and 'Infection' continuously increased over time, while those of 'Schistosoma mansoni' and 'Mesenteric lymph nodes' decreased. The diversification of keyword co-occurrence networks could be observed in the co-occurrence network maps.

    CONCLUSIONS: This bibliometric analysis reveals trends in research themes in the fields of Schistosoma and Toxoplasma gondii from 1980 to 2021, presenting China's experience such as a high degree of government involvement and multidisciplinary participation in schistosomiasis and toxoplasmosis control and elimination.

    Matched MeSH terms: Toxoplasmosis*
  9. An age-adjusted seroprevalence study of Toxoplasma antibody in a Malaysian ophthalmology unit
    Singh S, Khang TF, Andiappan H, Nissapatorn V, Subrayan V
    Trans R Soc Trop Med Hyg, 2012 May;106(5):322-6.
    PMID: 22480791 DOI: 10.1016/j.trstmh.2012.01.009
    Toxoplasma gondii is a public health risk in developing countries, especially those located in the tropics. Widespread infection may inflict a substantial burden on state resources, as patients can develop severe neurological defects and ocular diseases that result in lifelong loss of economic independence. We tested sera for IgG antibody from 493 eye patients in Malaysia. Overall age-adjusted seroprevalence was estimated to be 25% (95% CI: [21%, 29%]). We found approximately equal age-adjusted seroprevalence in Chinese (31%; 95% CI: [25%, 38%]) and Malays (29%; 95% CI: [21%, 36%]), followed by Indians (19%; 95% CI: [13%, 25%]). A logistic regression of the odds for T. gondii seroprevalence against age, gender, ethnicity and the occurrence of six types of ocular diseases showed that only age and ethnicity were significant predictors. The odds for T. gondii seroprevalence were 2.7 (95% CI for OR: [1.9, 4.0]) times higher for a patient twice as old as the other, with ethnicity held constant. In Malays, we estimated the odds for T. gondii seroprevalence to be 2.9 (95% CI for OR: [1.8, 4.5]) times higher compared to non-Malays, with age held constant. Previous studies of T. gondii seroprevalence in Malaysia did not explicitly adjust for age, rendering comparisons difficult. Our study highlights the need to adopt a more rigorous epidemiological approach in monitoring T. gondii seroprevalence in Malaysia.
    Matched MeSH terms: Toxoplasmosis/diagnosis*; Toxoplasmosis/ethnology; Toxoplasmosis/immunology
  10. Fulltext An evaluation of a recombinant multiepitope based antigen for detection of Toxoplasma gondii specific antibodies
    Hajissa K, Zakaria R, Suppian R, Mohamed Z
    BMC Infect Dis, 2017 12 29;17(1):807.
    PMID: 29284420 DOI: 10.1186/s12879-017-2920-9
    BACKGROUND: The inefficiency of the current tachyzoite antigen-based serological assays for the serodiagnosis of Toxoplasma gondii infection mandates the need for acquirement of reliable and standard diagnostic reagents. Recently, epitope-based antigens have emerged as an alternative diagnostic marker for the achievement of highly sensitive and specific capture antigens. In this study, the diagnostic utility of a recombinant multiepitope antigen (USM.TOXO1) for the serodiagnosis of human toxoplasmosis was evaluated.

    METHODS: An indirect enzyme-linked immunosorbent assay (ELISA) was developed to evaluate the usefulness of USM.TOXO1 antigen for the detection of IgG antibodies against Toxoplasma gondii in human sera. Whereas the reactivity of the developed antigen against IgM antibody was evaluated by western blot and Dot enzyme immunoassay (dot-EIA) analysis.

    RESULTS: The diagnostic performance of the new antigens in IgG ELISA was achieved at the maximum values of 85.43% and 81.25% for diagnostic sensitivity and specificity respectively. The USM.TOXO1 was also proven to be reactive with anti- T. gondii IgM antibody.

    CONCLUSIONS: This finding makes the USM.TOXO1 antigen an attractive candidate for improving the toxoplasmosis serodiagnosis and demonstrates that multiepitope antigens could be a potential and promising diagnostic marker for the development of high sensitive and accurate assays.

    Matched MeSH terms: Toxoplasmosis/diagnosis*; Toxoplasmosis/immunology
  11. Antibodies to Toxoplasma gondii from domestic animals in Malaysia
    Rajamanickam C, Cheah TS, Paramasvaran S
    Trop Anim Health Prod, 1990 Feb;22(1):61-2.
    PMID: 2321262
    Matched MeSH terms: Toxoplasmosis, Animal/epidemiology*
  12. Antigen specific lymphocyte proliferative response of patients with acute and chronic toxoplasmosis
    Khairul Anuar A, Rahmah N, Dighe VC, Zurainee MN, Suresh K, Yano A
    JUMMEC, 1999;4:34-38.
    In vitro lymphocyte proliferative response of peripheral blood leucocytes (PBL) to purified Toxoplasma gondii antigen were evaluated by 3[H] methyl thymidine incorporation in patients acutely and chronically infected with Toxoplama gondii. PBL from three patients with acute sylnptonlatic toxoplaslnosis showed no response to T. gondii antigen during the emergence of anti-Toxoplasma 1gM antibodies and the response returned as the infection became chronic. Lymphocytes of twelve chronically-infected patients responded positively to the antigen. In all patients the lymphocyte proliferative response to the mitogen, Concanavalill A (Con A) was normal. Analysis of Toxoplasma proliferative response of PBL from a patient with acute toxoplasrnosis showed that CD8+ cells were responsible for induction of suppression while the response during the chronic infection was lnediated by CD4+ cells. In human toxoplasmosis there was antigen-specific lymphocyte unresponsiveness during the acute phase of the infection and it appears that the initnunesuppression was mediated by CD8+ cells. KEYWORDS: Toxoplasmosis-lymphocyte blastogenesis-antigen specific-CD4+, CD8+
    Matched MeSH terms: Toxoplasmosis
  13. Fulltext CNS toxoplasmosis induced hydrocephalus revisited and a brief review of AIDS dementia complex
    Chow MB
    Med J Malaysia, 2013 Jun;68(3):278.
    PMID: 23749026
    Matched MeSH terms: Toxoplasmosis, Cerebral*
  14. Fulltext CNS toxoplasmosis presenting with obstructive hydrocephalus in patients of retroviral disease--a case series
    Basavaprabhu A, Mahalingam S, Deepak M, Satish R
    Med J Malaysia, 2012 Apr;67(2):214-6.
    PMID: 22822648
    CNS toxoplasmosis presenting as hydrocephalus is a very rare entity. We present three cases of HIV positive patients whose brain imaging revealed hydrocephalus and who improved with anti toxoplasma medication along with intravenous steroids and did not require any CSF shunting procedures. The mechanism of hydrocephalus in CNS toxoplasmosis is usually due to compression of CSF outflow pathway by ring enhancing lesions but even in their absence hydrocephalus can be rarely seen due to ventriculitis. Hence in HIV positive patients with unexplained hydrocephalus CNS toxoplasmosis should be considered and such patients if started on treatment early have a good prognosis without requiring neurosurgical intervention.
    Matched MeSH terms: Toxoplasmosis, Cerebral/diagnosis*; Toxoplasmosis, Cerebral/drug therapy
  15. Fulltext Cerebral toxoplasmosis in systemic lupus erythematosus following intravenous methylprednisolone
    Pagalavan L, Kan FK
    Med J Malaysia, 2011 Mar;66(1):68-70.
    PMID: 23765150 MyJurnal
    Cerebral toxoplasmosis is a rare complication of systemic lupus erythematosus (SLE). An 18 year old male student, newly diagnosed to have SLE, developed neurological symptoms two days after completing intravenous methylprednisolone. Computed tomography (CT) scan showed features consistent with a diagnosis of probable cerebral toxoplasmosis. He responded dramatically to antitoxoplasma therapy. To our knowledge, this is the first case report in the literature that presents a newly diagnosed SLE patient who rapidly developed cerebral toxoplasmosis following administration of intravenous methylprednisolone. Our case illustrates that this drug is potentially fatal and the importance of differentiating cerebral infection from neuropsychiatric lupus.
    Matched MeSH terms: Toxoplasmosis, Cerebral*
  16. Fulltext Cervical toxoplasma lymphadenitis: report of a case
    Siar CH, Foo GC
    Med J Malaysia, 1984 Dec;39(4):306-10.
    PMID: 6544939
    Toxoplasmosis is a parasitic infection of worldwide distribution. It is caused by an obligate intracellular parasite, Toxoplasma gondii. The commonest form of this disease is the acquired simple lymphadenopathy. Such a case is described and the clinicopathological significance of the disease is discussed.
    Matched MeSH terms: Toxoplasmosis/drug therapy; Toxoplasmosis/pathology*
  17. Fulltext Characterisation of a truncated Toxoplasma gondii surface antigen 2 (SAG2) secreted by the methylotrophic yeast Pichia pastoris
    Lau YL, Shamilah H, Fong MY
    Trop Biomed, 2006 Dec;23(2):186-93.
    PMID: 17322821 MyJurnal
    A truncated form of surface antigen 2 (SAG2) of the protozoan parasite Toxoplasma gondii was cloned and expressed in the methylotrophic yeast Pichia pastoris. This recombinant antigen, designated as recSAG2-N, contained only the N-terminal half of the native SAG2. The recSAG2-N was secreted by the Pichia pastoris into the culture supernatant, and it was harvested by using the trichloroacetic acid precipitation method. Specificity of recSAG2-N was evaluated in western blot assays. Fifty human serum samples, including 32 from confirmed cases of toxoplasmosis, were tested. Results from the assays showed that recSAG2-N reacted with sera from the toxoplasmosis cases only. In vivo experiments showed that serum from mice which received recSAG2-N reacted with the native SAG2 of T. gondii.
    Matched MeSH terms: Toxoplasmosis/diagnosis
  18. Chronic mucocutaneous candidiasis with deficient CD2 (E receptor) but normal CD3 mononuclear cells
    Noh LM, Hussein SH, Sukumaran KD, Rose I, Abdullah N
    J Clin Lab Immunol, 1991 Jun;35(2):89-93.
    PMID: 1688166
    A case of chronic mucocutaneous candidiasis in a Malaysian child who subsequently developed disseminated tuberculosis and toxoplasmosis is described. The phenotype of her peripheral blood mononuclear cells showed discordance for her T cell markers. The presence of a subpopulation of CD2-/CD3+ mononuclear cells leading to an immunodeficiency state is consistent with failure of activation of CD2-mediated alternative pathway resulting in immunodeficiency. Such abnormal CD2-/CD3+ subpopulations have been described in lepromatous leprosy and foetal abortuses.
    Matched MeSH terms: Toxoplasmosis/complications; Toxoplasmosis/immunology
  19. Fulltext Cloning and expression of Toxoplasma gondii dense granular protein 4 (GRA4) in Pichia pastoris
    Lau YL, Hasan MT, Thiruvengadam G, Idris MM, Init I
    Trop Biomed, 2010 Dec;27(3):525-33.
    PMID: 21399595
    GRA4 of Toxoplasma gondii has been shown to prompt IgG, IgM and IgA responses in previous studies and is thus considered one of the major immunogenic proteins from T. gondii that can be used for both diagnostics purposes and vaccine development. This study seeks to clone and express the GRA4 in Pichia pastoris, which has numerous advantages over other systems for expression of eukaryotic proteins. In order to achieve this, the gene was cloned into the pPICZα A expression vector, which was then incorporated into the P. pastoris genome via insertional integration for expression of the recombinant protein, under the AOX1 promoter. The antigen was expressed along with the prepro sequence of the α-factor of yeast so that it could be excreted out of the P. pastoris cells and obtained from the medium. Upon SDS-PAGE analysis it was found that the recombinant protein was expressed optimally as a 40 kDa protein after 96 hours of induction with 0.75% of methanol. The expressed GRA4 protein showed discrepancy in size with the calculated molecular mass. This may be attributed to the various posttranslational modifications including glycosylation and phosphorylation. Despite the difference in molecular weight, the recombinant protein was able to detect toxoplasmosis in Western blot format. The recombinant GRA4 was expressed with an intact polyhistidine-tag, which could be used for future purification of the antigen.
    Matched MeSH terms: Toxoplasmosis/diagnosis*
  20. Cloning and expression of Toxoplasma gondii dense granule antigen 2 (GRA2) gene by Pichia pastoris
    Lau YL, Fong MY, Idris MM, Ching XT
    Southeast Asian J. Trop. Med. Public Health, 2012 Jan;43(1):10-6.
    PMID: 23082548
    Detection of Toxoplasma gondii infection is essential in pregnant women and immunosuppressed patients. Numerous studies have shown that the recombinant production of several Toxoplasma antigens, including dense granule antigens (GRAs) has high potential as diagnostic reagents. In the present study, we produced GRA2 using Pichia pastoris system. RNA of T. gondii RH strain tachyzoite was used as a template to produce cDNA clones of full-length GRA2 via reverse transcriptase PCR. Amplicons were inserted into pPICZalpha A and the recombinant plasmid transformed into P. pastoris, X-33 strain. The expressed recombinant protein was identified by SDS-PAGE and Western blotting. A recombinant protein of -28 kDa was produced, which could be detected by toxoplasmosis positive human sera indicating that the recombinant protein retained its antigenicity. The present study indicates that P. pastoris-expressed GRA2 should be useful for detection of Toxoplasma infection.
    Matched MeSH terms: Toxoplasmosis/diagnosis
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