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| Content Provider | PubMed Central |
|---|---|
| Author | Cheesman, Sandra Raza, Ahmed Carter, Richard |
| Copyright Year | 2006 |
| Abstract | Important to malaria vaccine design is the phenomenon of “strain-specific” immunity. Using an accurate and sensitive assay of parasite genotype, real-time quantitative PCR, we have investigated protective immunity against mixed infections of genetically distinct cloned “strains” of the rodent malaria parasite Plasmodium chabaudi chabaudi in mice. Four strains of P. c. chabaudi, AS, AJ, AQ, and CB, were studied. One round of blood infection and drug cure with a single strain resulted in a partial reduction in parasitemia, compared with levels for naïve mice, in challenge infections with mixed inocula of the immunizing (homologous) strain and a heterologous strain. In all cases, the numbers of blood-stage parasites of each genotype were reduced to similar degrees. After a second, homologous round of infection and drug cure followed by challenge with homologous and heterologous strains, the parasitemias were reduced even further. In these circumstances, moreover, the homologous strain was reduced much faster than the heterologous strain in all of the combinations tested. That the immunity induced by a single infection did not show “strain specificity,” while the immunity following a second, homologous infection did, suggests that the “strain-specific” component of protective immunity in malaria may be dependent upon immune memory. The results show that strong, protective immunity induced by and effective against malaria parasites from a single parasite species has a significant “strain-specific” component and that this immunity operates differentially against genetically distinct parasites within the same infection. |
| Related Links | http://dx.doi.org/10.1128/iai.74.5.2996-3001.2006 |
| Ending Page | 3001 |
| Page Count | 6 |
| Starting Page | 2996 |
| File Format | |
| ISSN | 00199567 |
| e-ISSN | 10985522 |
| Journal | Infection and Immunity |
| Issue Number | 5 |
| Volume Number | 74 |
| Language | English |
| Publisher | American Society for Microbiology |
| Publisher Date | 2006-05-01 |
| Access Restriction | Open |
| Rights Holder | American Society for Microbiology |
| Subject Keyword | Immunology Microbiology Parasitology Infectious Diseases Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Infectious Diseases Parasitology Immunology Microbiology |
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