You are examining a urine sample from an individual with a suspected urinary tract infection. you were unable to observe/detect any microbes until you viewed the sample at 1000x tm. to which domain of life does the disease-causing microbe belong?

Bacteria domain.

Explanation:

Urinary tract infection is any microorganism infection that affects the urinary tract. Depending on the structure affected, the infection has different names: urethritis (urethra), cystitis (bladder) or pyelonephritis (kidneys). Although various microorganisms can cause the problem, Escherichia coli bacteria are usually responsible for the problem, which is naturally present in the gut and important for digestion but pathogenic to the urinary tract. The bacteria responsible for this infection belong to the Bacteria domain.

The Bacteria domain encompasses microcellular, unicellular and prokaryotic organisms that were previously classified as eubacteria. This domain encompasses bacteria that cause disease to man and also those found in environments such as water and soil. The microorganisms that cause urinary infection belong to this domain.

Gram positive bacteria are held responsible for causing infection in in urinary tract. And this bacteria are so small in size that we are unable to observe or detect there sample.

Testing and analysis of urine sample is termed as urinalysis. But in case of infection in tract observer are unable to find any microorganism when looking up 1000X in microscope. It is so because of Gram positive bacteria. When urine sample is tested it gives information about digestive system, quality of blood, excretory system, normal functioning of kidney, etc.  

how is this health related