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Hypothermia-inducing peptide promotes recovery of vesicular stomatitis virus from persistent animal infections.

ABSTRACT

A single injection of the hypothermia-inducing neuropeptide bombesin resulted in an excellent recovery system for reisolating viruses from Swiss albino mice infected with vesicular stomatitis virus even up to 90 days after infection. The virus was recovered from a cell homogenate prepared from whole brain tissue 24 h after intracerebral injection of bombesin; brain cells were cocultivated with BHK-21 cell monolayers and then plaqued on BHK-21 cells at 31 degrees C. All of the recovered viruses were identified as vesicular stomatitis virus by antibody neutralization and peptide analyses of some of the structural proteins. However, some of the recovered viruses were altered with regard to tryptic peptide maps, temperature sensitivity, and central nervous system disease induced compared with the viruses used to initiate the infection. Most of the recovered viruses induced a similar disease when reinoculated intracerebrally into mice, characterized by hind-leg paralysis 4 to 6 days after infection. Two of the recovered viruses were lethal, however, resulting in a relatively rapid generalized wasting disease and death in 3 to 4 days.

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