Normal urine color can vary from pale or light yellow to deep amber or dark yellow and is the result of the presence of a pigment called urochrome. From: Nephrology Secrets (Third Edition), 2012 About this pageSet alert Also in subject areas: Biochemistry, Genetics and Molecular Biology Nurs...
Similarly, substantial bacterial infection can result in pyuria that appears white, as can mycobacterial infection, such as that with tuberculosis involving the urinary tract. Lymphatic drainage into the urinary tract, or chyluria, is another source of white urine discoloration. Mucus in the urine ...
In addition, even if infectious virus is detected in cell culture, it doesn't necessarily imply that it will cause infection in the upper respiratory tract of humans at the same dose, as physicochemical barriers (e.g. mucus, low pH) can further limit virus infectivity (NIS-PHE, 2020). ...