The FDA approved Johnson & Johnson’s single-dose coronavirus vaccine. This makes it the third vaccine available in the fight against COVID-19. Unlike Pfizer’s and Moderna’s vaccines, Johnson & Johnson’s one-dose regimen eliminates the need for patients to return for a second dose and it can be stored at refrigerator temperatures for months. The federal government plans to distribute nearly 4 million doses of J&J’s vaccine to states, pharmacies and community health centers across the nation immediately.