New Impact Factor values for scientific journals for the year 2023 have been published in the Journal Citation Reports database, owned by Clarivate Analytics. Impact factor values for individual journals can be checked at: https://jcr.clarivate.com/jcr/home, while the full list of papers published by Hirszfeld Institute staff in 2023, with current Impact Factor values, can be found under Reports and Publications: https://hirszfeld.pl/instytut/raporty-i-publikacje/.