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| Content Provider | PubMed Central |
|---|---|
| Author | Pei, Z. Blaser, M. J. |
| Abstract | We developed a mouse model to compare the virulence of Campylobacter fetus strains with (S-plus) and without (S-minus) surface array protein (S-protein) capsules. In adult HA/ICR mice pretreated with ferric chloride, the LD50 for S-plus strain 84-32 was 43.3 times lower than its spontaneous S-minus mutant 84-54. Seven strains of inbred mice were no more susceptible than the outbred strain. In contrast to the findings with Salmonella typhimurium by others, 3 X 10(7) CFU of strain 84-32 caused 90% mortality in C3H/HeN (LPSn) mice and 40% mortality in C3H/HeJ (LPSd) mice. High-grade bacteremia in HA/ICR mice occurred after oral challenge with S-plus C. fetus strains and continued for at least 2 d, but was not present in any mice challenged with S-minus strains. Bacteremia at 30 min after challenge was 51.6-fold lower in mice pretreated with 10 microliters of rabbit antiserum to purified S-protein than after pretreatment with normal rabbit serum. Challenge of mice with a mixture of S-minus strain 84-54 and free S-proteins at a concentration 31.1-fold higher than found in wild-type strain 84-32 caused 30% mortality, compared with 0% with strain 84-54 or S-protein alone. These findings in a mouse model point toward the central role of the S-protein in the pathogenesis of C. fetus infection. The S-protein is not toxic per se, but enhances virulence when present on the bacterial cell surface as a capsule. |
| Related Links | http://dx.doi.org/10.1172/jci114533 |
| Ending Page | 1043 |
| Page Count | 8 |
| Starting Page | 1036 |
| File Format | |
| ISSN | 00219738 |
| Journal | Journal of Clinical Investigation |
| Issue Number | 4 |
| Volume Number | 85 |
| Language | English |
| Publisher Date | 1990-04-01 |
| Access Restriction | Open |
| Subject Keyword | Medicine(all) Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine |
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