Abstract
Haig and Hilleman (1950) have demonstrated a mouse erythrocyte hemagglutinin in the allantoic fluid of embryonated eggs infected with the meningopneumonitis strain of ornithosis virus. This report describes the production of a similar hemagglutinin by another member of the psittacosis-lymphogranuloma group, the feline pneumonitis virus of Baker (1942). The hemagglutinin produced by the growth of feline pneumonitis virus in the allantoic cavity of embryonated eggs was completely separated from the infective virus particles and could be concentrated by differential centrifugation or by adsorption on the flocculent precipitate produced by freezing and thawing infected allantoic fluid. Simultaneous
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