4. Figure 1 (see next page) depicts the timeline of Sammy's chlamydia infection. Each panel of the figure represents a blood sample, showing a stain of the chlamydia bacteria. The red dots indicate the initial chlamydia bacteria, and the yellow dots indicate the mutated chlamydia bacteria. Provide detailed captions for the images under the titles, specifically indicating how the bacteria population changed over time. "The Fight Against Bacteria" by Jessie M. Garcia Page 3 NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE Figure 1a. Initial chlamydia infection. Figure 1b. Three days into the doxycycline treatment. Figure 1c. Sammy stops taking her antibiotic pills. Figure 1d. One week after the doxycycline treatment. Figure 1e. Two weeks after the doxycycline treatment.

4. Figure 1 (see next page) depicts the timeline of Sammy's chlamydia infection. Each panel of the figure represents a blood sample, showing a stain of the chlamydia bacteria. The red dots indicate the initial chlamydia bacteria, and the yellow dots indicate the mutated chlamydia bacteria. Provide detailed captions for the images under the titles, specifically indicating how the bacteria population changed over time. "The Fight Against Bacteria" by Jessie M. Garcia Page 3 NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE Figure 1a. Initial chlamydia infection. Figure 1b. Three days into the doxycycline treatment. Figure 1c. Sammy stops taking her antibiotic pills. Figure 1d. One week after the doxycycline treatment. Figure 1e. Two weeks after the doxycycline treatment.