Detection of cross-reactions by immunofluorescence within the picornavirus group

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Abstract
A rapid and sensitive method has been developed to determine the degree of cross-reactions within the picornavirus group by the indirect method of fluorescent antibody staining in green monkey kidney cells. The viruses included in the study were poliovirus type 1, 2, and 3; echovirus type 3, 9, and 11; and coxsackievirus type A9 and B5. It has been found that the cross-reactions are in fact extensive amongst the viruses tested. The heterologous reactions were almost as strong as homologous reactions. The degree of group reactivity was unexpected and its implication and advantages are discussed.

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