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I have not been able to find in the literature any other case of asthma with this particular botanic causation.
Mrs. B., aged 45, seen, March 9, 1925, for many years had had severe bronchial asthma lasting daily and almost continuously for several weeks from the middle of March to the end of April, with complete freedom from allergic symptoms at all other seasons of the year. She had lived in the same neighborhood in San Antonio for many years and had always been at home at this season.
The sharply defined seasonal incidence and cessation of the asthma suggested a tree as the only known air-borne pollination possibility coinciding with the history. Intradermal tests were positive to the pollens of the grasses and ragweeds, obviously impossible factors in her case. Of the trees pollinating at this season in the locality, tests were negative to the various oak pollens, pecan,
Kahn IS. BRONCHIAL ASTHMA DUE TO HACKBERRY (CELTIS) POLLEN. JAMA. 1926;86(5):346. doi:10.1001/jama.1926.26720310001009a
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