COVID-19 vaccine trials continue in the Valley as frontline workers receive first doses of Pfizer's vaccine
As health care workers across the Valley receive the first doses of Pfizer's COVID-19 vaccine, trials for three other vaccine companies are underway in McAllen.
Finding diverse participants is a common problem for new vaccine trials.
In the Valley, 705 people enrolled in the Moderna Inc. vaccine trial, another 230 enrolled for AstraZeneca's.
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