A 2020 study at Oxford University, UK, found that compared to antibiotics and cough medicine, raw organic honey reduced cough intensity and frequency. Raw organic honey contains glucose oxidase enzymes which convert the glucose in honey into gluconic acid, hydrogen peroxide, and free radicals that destroy bacteria. Bacteria cannot survive in hydrogen peroxide. That is where the antibacterial power of raw organic honey comes from.
A 2019 multinational study published in the Frontiers of Microbiology journal reported positive effects of curcumin on viral pneumonia. Viral pneumonia is currently widespread as a complication of coronavirus. Golden honey milk is an old Ayurvedic recipe to relieve dry cough.