What’s especially puzzling is why these two groups—presymptomatic transmitters and asymptomatic cases—appear so frequently. Other viruses, such as influenza and colds, spread silently too.

Medically reviewed by Anju Goel, MD Pyuria is a term that describes the presence of pus, which is mostly made up of white blood cells, in urine. Urine typically contains very few or no white blood ...