Stock Photo - 14 November 2021, Berlin: Hendrik Streeck, virologist, and Yael Adler, physician and author, hold the new book ""Our Immune System"" at a book presentation. The book has been published by Piper Verlag. Streeck is director of the Institute for Virology and HIV Research at the Medical Faculty of the University of Bonn, Adler is a dermatologist and author of non-fiction books. Photo: Fabian Sommer/dpa. - Berlin/Berlin/Germany

Stock Photo: 14 November 2021, Berlin: Hendrik Streeck, virologist, and Yael Adler, physician and author, hold the new book ""Our Immune System"" at a book presentation.

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