23 people have a severe allergic reaction to Moderna's vaccine in California

Twenty-three people inoculated with Moderna's vaccine in San Diego, California, had a severe allergic reaction within 24 hours of the injection. But the authorities of the California Health Service recommend that the remaining vaccines of that batch not be used, which was also delivered in more than 200 clinics and of which no evidence of adverse reactions has been reported at the time of recording this interview. Dr. Elmer Huerta clarifies the difference between "efficacy" and "efficiency" in epidemiological terms at a time when the United States exceeds the barrier of 400,000 deaths from covid-19