Take a stool sample with you so that it can be tested for traces of the virus. (dog-health-guide.org)
After all, vaccines are effective because they contain weak traces of the viruses they protect against. (woolino.com)
A team of American researchers thought it finally struck pay dirt last October when it reported in Science that it found DNA traces of a virus in the blood cells of two - thirds of 101 patients with CFS, compared with 4 % of 218 healthy controls. (sciencemag.org)