TIs or pneumonia, which account for 15% of all pediatric fatalities under the age of five and cause significant morbidity, continue to be a serious global health issue. The most dangerous infection lately COVID-19 associated with bacterial superinfections, which results in a fatal acute respiratory infection marked by shortness of breath. Scientists continue to face significant challenges in the development of vaccines and antiviral or antibacterial medications to treat these diseases. Recently, Bioactive natural products from a variety of plants and organisms, such as bacteria, fungi, and algae, hold promise as treatments for cancer, bacterial infections, inflammatory diseases, and other medical conditions. To facilitate the transport of these bioactive compounds to a particular target, nanoparticles drug delivery system can be adopted. Nanotechnology has been recognized as an essential tool in vast human medical fields. The goal of this review is to highlight prior and ongoing research on naturally occurring active nanomaterials as antiviral or antimicrobial agents, particularly for diseases of the modern era like COVID-19, and to R 514 Naglaa M. Hamdy et al.