The county was testing about 2,500 people a day in July and August, but that number dropped to 500. In the city, 18,000 people were tested the week of July 23, but only 8,200 people were tested the week of Sept. 24, said Dr. Umair Shah, executive director of Harris County Public Health. "I do think there's some (COVID-19) fatigue," said Dr. Shah, who doesn't know exactly why testing is down.