Abstract
The serum antibody response and differential corneal response to primary and secondary infections by Pseudomonas aeruginosa were investigated in DBA/2J (resistant) and C57BL/6J (susceptible) mice, since they respond differently to intracorneal challenge. Using an enzyme-linked immunosorbent assay, we found that naturally resistant DBA/2J mice mounted a significant immunoglobulin M (IgM) and IgG response to P. aeruginosa within 7 days postinfection of one eye; this was subsequently followed by a drop in the IgM response. Of 31 mice, 30 were able to restore corneal clarity within 3 to 4 weeks. However, when C57BL/6J mice were infected intracorneally, their levels of serum antibody developed more slowly than did those of the DBA/2J mice, and they were unable to restore corneal clarity within 8 to 12 weeks. None of the mice from either test strain mounted a detectable serum IgA response to P. aeruginosa over a 90-day holding period. However, infection of the contralateral, normal cornea of mice of both test strains resulted in a heightened IgG response to P. aeruginosa within 30 days after the secondary infection. Many (50%) of the susceptible C57BL/6J mice recovered or exhibited less severe corneal damage within the 30-day holding period. If the C57BL/6J mice were reinfected 60 days after the primary infection instead of after 30 days, most (89%) of the mice had restored corneal clarity within 3 to 6 days. Passive transfer of immune serum from either recovered DBA/2J or C57BL/6J mice to naive C57BL/6J mice resulted in the restoration of corneal clarity in many of the recipients following infection.
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Selected References
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