Northwest Harris County, Texas – Enrollment will soon begin for a pediatric Johnson & Johnson COVID-19 vaccine trial in Harris County, according to DM Clinical Research. The trial is set to begin in the next few weeks and will include participants who are under the age of 18. Moderna is also about to begin a trial with children under the age of 12. Hasan says other drug companies are also about to begin trials as well. It’s the one that they best fit into based off of their age, based off their demographic, and based off their medical history,” Hasan said.