Historically, staphylococci, pseudomonads, and Escherichia coli have been the nosocomial infection troika; nosocomial pneumonia, surgical wound infections, and vascular accessrelated bacteremia have caused the most illness and death in hospitalized patients; and intensive care units have been the epicenters of antibiotic resistance.
A warm spot can be noticed in the portion of your arm where there occurred the blood clot. You can also feel like having a burning sensation around the affected area and also at times you might feel like the area is warm when touched. In case of serious blood clots in arm, the area affected can turn red and inflamed.
I would like to add: when a blod clot begins you feel a tightness where the clot is located. If it's in your leg, for example, you may feel your calf tighten-up. You may feel stiff, like when you over-exercise or lift something too heavy. The warmth, I have found, is the most obvious sign that you have a clot. There may also be discoloration, a light purple tinge, in your skin. If that happens, you may have deep-vein thrombosis and that can be very serious. One more thing, know that a clot does not always cause pain. You may feel a little tingling and, unless the clot is severe, you may still be able to walk on it--but don't! When I suspect a clot, I immediately pull out my walking cane and take the weight off of it.