FIG 4 .

METH-treated animals displayed fewer phagocytes in blood. (A) Light microscopy images of blood smears from untreated or METH-treated mice preinfection. Arrows indicate phagocytic cells (purple). Bar, 20 µm. (B) Numbers of phagocytic cells per field in blood of untreated or METH-treated mice. Each black circle or red square represents the number of neutrophils per individual field. Dashed lines and error bars denote averages and standard deviations of 40 counts, respectively. Asterisks denote significant P values (P < 0.05), calculated using Student’s t test. The experiment was performed twice with similar results obtained. The results shown are a combination of two independent experiments.