Intestinal protozoan infections are typically spread by vectors. the respiratory route. blood transfusion the fecal-oral route. body fluids. Question 41 ( 2 points) What does it mean to say that HSV-1 is often latent? It undergoes periods of inactivity when it resides in trigeminal nerve ganglia and does not cause symptoms. It undergoes cycles of rapid growth and slower growth, affecting the symptoms that can be observed. It is normally difficult to detect even when causing an active infection, unless appropriate screening tests are conducted. It is always present in infected individuals, but lesions may be small or hidden. Blood agar plates are selective for Gram positive bacteria because of red cell hemolysis. are differential for Gram positive because of high salt. are differential for Gram positive bacteria because of red cell hemolysis. are selective for Gram negative bacteria because of red cell hemolysis. Question 43 ( 2 points) The cause of strep throat is Streptococcus pneumoniae. Staphylococcus aureus-beta-hemolytic, group A. Streptococcus pyogenes-beta-hemolytic, group A. Staphylococcus aureus. Staphylococcus pyogenes-alpha-hemolytic, group B..