Common colds are infectious and are probably due to an ultramicroscopic germ. These are the findings of Dr. Peter K. Olitsky and Dr. J. E. McCartney, of the Rockefeller Institute for Medical Research, after four years of experiments on human volunteers. Filtered washings from the noses of cold sufferers were injected into healthy persons, who promptly developed colds, which were in turn transmissable. The causative germ could not be seen, although cultures were grown from the secretions of 40 patients. Either the germ is so small that it cannot be seen through...
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