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HHV-6 increases risk of an “idiopathic” pneumonia syndrome after HCT as does murine roseolovirus in a BMT mouse model. Early HHV-6 was also found to increase non-relapse mortality

In All, Animal Models, Lung Disease, Transplant Complications by Kristin Loomis

Investigators from University of Michigan have demonstrated that murine roseolovirus is a useful homolog for the study of HHV-6 reactivation in lung disease. In a large retrospective study of HCT patients, they also found early HHV-6 reactivation to increase the risk of both idiopathic pneumonia syndrome and non-relapse mortality.

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HHV-6 can cause “idiopathic” pneumonia

In All, Lung Disease by hhv6foundation

A pivotal study, led by Michael Boeckh at the Fred Hutchinson Cancer Research Center, has determined that occult infections contribute to 57% of all cases of “idiopathic” pneumonia syndrome (IPS), a condition previously assumed to be non-infectious. HHV-6 was the dominant pathogen representing 29% of cases.