my baby boy is 10 month old and he is teething and pass loose motion , today i consult to doctor and he recommend complete stool analysis including rota virus , i received test report of complete stool analysis , according to report (1) RBCs 0-1 /HPF, (2) pus cells 8-10/HPF, please answer that , whats mean HPF ? is it ok and satisfactory result rota virus is negative,