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Plamen Todorov Titorenkov, Milena Dimitrova Encheva and Aneliya Lazarova Gotseva. Respiratory infections in the XXI century: Challenges and changes. World Journal of Advanced Research and Reviews, 2024, 23(3), 1900-1906. Article DOI: https://doi.org/10.30574/wjarr.2024.23.3.2730