Abstract:
:Resurgence is a major concern after malaria elimination. After the initiation of the elimination program on Aneityum Island in 1991, microscopy showed that Plasmodium falciparum disappeared immediately, whereas P. vivax disappeared from 1996 onward, until P. vivax cases were reported in January 2002. By conducting malariometric surveys of the entire population of Aneityum, we investigated the age distribution of individuals with parasites during this epidemic in the context of antimalarial antibody levels and parasite antigen diversity. In July 2002, P. vivax infections were detected by microscopy in 22/759 individuals: 20/298 born after the beginning of the elimination program in 1991, 2/126 born between 1982 and 1991, and none of 335 born before 1982. PCR increased the number of infections detected to 77, distributed among all age groups. Prevalences were 12.1%, 16.7%, and 6.0%, respectively (P < 0.001). In November, a similar age pattern was found, but with fewer infections: 6/746 and 39/741 individuals were found to be infected by microscopy and PCR, respectively. The frequencies of antibody responses to P. vivax were significantly higher in individuals born before 1991 than in younger age groups and were similar to those on Malakula Island, an area of endemicity. Remarkably low antigen diversity (h, 0.15) of P. vivax infections was observed on Aneityum compared with the other islands (h, 0.89 to 1.0). A P. vivax resurgence was observed among children and teenagers on Aneityum, an age distribution similar to those before elimination and on islands where P. vivax is endemic, suggesting that in the absence of significant exposure, immunity may persist, limiting infection levels in adults. The limited parasite gene pool on islands may contribute to this protection.
journal_name
Infect Immunjournal_title
Infection and immunityauthors
Kaneko A,Chaves LF,Taleo G,Kalkoa M,Isozumi R,Wickremasinghe R,Perlmann H,Takeo S,Tsuboi T,Tachibana S,Kimura M,Björkman A,Troye-Blomberg M,Tanabe K,Drakeley Cdoi
10.1128/IAI.00931-13subject
Has Abstractpub_date
2014-01-01 00:00:00pages
243-52issue
1eissn
0019-9567issn
1098-5522pii
IAI.00931-13journal_volume
82pub_type
杂志文章abstract::Citrobacter rodentium, an attaching-effacing bacterial pathogen, establishes an acute infection of the murine colonic epithelium and induces a mild colitis in immunocompetent mice. This study describes the role of T-cell subsets and B lymphocytes in immunity to C. rodentium. C57Bl/6 mice orally infected with C. rodent...
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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doi:10.1128/IAI.40.2.741-751.1983
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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doi:10.1128/IAI.7.4.597-599.1973
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journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.69.4.1994-2000.2001
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journal_title:Infection and immunity
pub_type: 杂志文章
doi:10.1128/IAI.15.1.124-131.1977
更新日期:1977-01-01 00:00:00
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journal_title:Infection and immunity
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doi:10.1128/IAI.5.5.715-722.1972
更新日期:1972-05-01 00:00:00
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journal_title:Infection and immunity
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journal_title:Infection and immunity
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更新日期:1999-12-01 00:00:00
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