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Effect of CD8+ T cells on arterial oxygenation during PCP in mice. PaO2 was measured in CD4-depleted, CD4/CD8–depleted, and anti-HRP–treated mice inoculated with P. carinii 17 or 34 days previously. Controls were uninfected C57BL/6 mice. Values are mean ± 1 SD (n = 5). *P < 0.05 vs. anti-HRP–treated and uninfected mice at 34 days after inoculation.
