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Until only weeks before his death at age 103, Heidelberger continued to study immunological cross reactions between various micro-organisms. In this article, Heidelberger, Klaus Jann, and Barbara Jann presented their findings on the cross-reactions between Escherichia coli polysaccharide antigens and Salmonella antibodies.
Periodical. Heidelberger, Michael, Klaus Jann, and Barbara Jann. "Crossreactions of Escherichia coli K and O Polysaccharides in Antipneumococcal and Anti-Salmonella Sera." Journal of Experimental Medicine 162, 4 (October 1985): 1350-1358. Article. 9 Images.. Journal of Experimental Medicine