A finger stick WBC count on a 20 yr old female is performed…

A finger stick WBC count on a 20 yr old female is performed using a standard hemocytometer to count the cells.  100 microliters (uL) of blood was diluted with 1.9 milliliters (mL) of diluent.  50 platelets were counted in 1 square measuring 1mm x 1 mm on one side of a standard hemocytometer.  Hemocytometer depth = 0.1 mm.  Calculate the platelet count.

A previously normal, full-term infant developed bilateral co…

A previously normal, full-term infant developed bilateral conjunctivitis at 2 weeks of age. The conjunctivitis was followed by severe coughing, but the infant remained afebrile. When the infant was 4 weeks old, a chest X-ray showed bilateral interstitial infiltrates. Aerobic bacterial culture grew only minimum amounts of normal flora organisms. Which of the following is the most probable infectious agent?