Abstract
Small numbers of virions (poliovirus 1) that were adsorbed to river water solids were eluted by mixing the solids for 30 min with a 10% solution of beef extract that contained sufficient Na2HPO4 to bring the molarity of the salt to 0.05 and sufficient citric acid to bring the pH to 7. The virions were recovered by inoculating the beef extract onto cell cultures [Buffalo green monkey BGM]. With this method, 39-63% of the poliovirions that were adsorbed onto the river solids were recovered.