SUMMARY: The passive haemagglutination test and the sensitivity of the haemagglutination inhibition test were investigated by using two plant viruses (tobacco mosaic virus and latent carnation virus) and an insect virus, tipula iridescent virus. The minimum quantities detectable by these methods were of the order of 0.26 to 0.015 μg. There was no direct agglutination by tobacco mosaic virus or tipula iridescent virus of erythrocytes from a variety of animals.
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