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Their pollen can cross-react with fruit and vegetables, including kiwi, banana, mango, avocado, grapes, celery, carrot and potato, and some herbs such as caraway, coriander, fennel, pepper and paprika.

The immune responses to the variants were highly dependent on the original B cell repertoire induced by the ancestral SARS-CoV-2 strain -- and on the ability of those cells to cross-react with BA.5 and XBB variants.

They sometimes cross-react with commonly used over-the-counter medications, as well as tea or protein powders sold within some state facilities, the report detailed.

Most affected babies only react to a single food, although some foods cross-react.

Chinese scientific papers and media have made much of such findings, but skeptics say the viral traces may be contaminants and the antibodies could be responses to other pathogens that “cross-react” with SARS-CoV-2.