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Alterations in cytokines and effects of dexamethasone immunosuppression during subclinical infections of invasive Klebsiella pneumoniae with hypermucoviscosity phenotype in rhesus (Macaca mulatta) and cynomolgus (Macaca fascicularis) macaques.

Invasive Klebsiella pneumoniae with the hypermucoviscosity phenotype (HMV K. pneumoniae) is an emerging human pathogen that also has been attributed to fatal multisystemic disease in African green monkeys at our institution. Combining a cluster of subclinically infected macaques identified in March and April 2008 and the animals documented during a subsequent survey of more than 300 colony nonhuman primates yielded a total of 9 rhesus macaques and 6 cynomolgus macaques that were subclinically infected. In an attempt to propagate the responsible HMV K. pneumoniae strain, a subset of these animals was immunosuppressed with dexamethasone. None of the treated animals developed clinical disease consistent with the multisystemic disease that affected colony African green monkeys. However, cytokine analysis revealed significant alterations of secreted cytokines in macaques subclinically infected with HMV K. pneumoniae when compared with noninfected macaques, thereby calling into question the suitability of animals subclinically infected with HMV K. pneumoniae for use in immunologic or infectious disease research.