Abstract

KUNST1 examined the effect of different strains of influenza virus on sulphonphthalein dyes and found that when various dyes of this group were inoculated into the allantoic fluid of eleven-day old chick embryos in the presence of swine influenza virus they faded after 48 hr., whereas the human strain of influenza virus A induced much less change though the haemagglutination titres of the two strains were more or less similar.

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