It’s back-to-school season, and Los Angeles County officials, educators, health experts and parents tuned in to a recent virtual town hall with the Los Angeles County Department of Public Health to discuss the county’s return to in-person learning on Aug. 16.   Last month, Los Angeles County reinstated an indoor face mask mandate for all residents regardless of vaccination status. Students attending in-person classrooms are expected to wear masks, and to practice physical distancing where possible.   Several parents who joined the town hall on Aug. 3 expressed concern for their younger children who are school age but not old enough to get vaccinated. The two-dose Pfizer vaccine is currently the only COVID-19 vaccine available for children 12 to 17 years of age.   Appearing at the town hall was Dr. Nava Yeganeh, a professor in the Division of Infectious Disease at the David Geffen School of Medicine who specializes in pediatrics.   Yeganeh outlined several safety measures students can take as …