5) Blood or pus in the urine
This is a very important sigh of urinary tract infections, and it is sometimes visible to the naked eye. In other cases, you will need to take a urine sample to the lab in order to detect hidden blood or pus in the urine. Pus in the urine is named pyuria and blood in the urine is named hematuria. The former gives urine a cloudy and blurry appearance, and the latter would rather change the color of the urine to a darker tone, and it might be red in some cases, especially when associated with kidney stones.
When your urine has pus it is because white blood cells have already crowded your kidneys or any other part of the urinary tract. In their struggle against the pathogens, they released inflammatory mediators and toxins to destroy the invaders and died. Thus, the magnitude of white blood cells in the lab samples would relate to the severity of the infection and the immune response against it. This is not a predominant symptom in patients with immune deficiency because it is associated with a normal immune function.
