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The virus of Ilhéus encephalitis was isolated from the blood of two birds captured in March, 1960, in the Province of Bocas del Toro in Panama. Five of 62 birds obtained in Bocas and 2 of 68 birds obtained in Darién had neutralizing antibodies against this virus in their blood.
* This investigation was supported by research grant E-2984 from the National Institutes of Health, U. S. Public Health Service.
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