The company said a Food and Drug Administration review concluded the shots remain safe and effective for at least 4 1/2 months. In February, the FDA originally authorized J&J’s vaccine for up to three months when stored at normal refrigeration levels.
Thursday’s announcement comes after state officials warned that many doses in storage would expire before the end of the month. The change gives health providers more time to try and use remaining J&J shots sitting at pharmacies, hospitals and clinics. Many states have adopted a “first-in-first-out” approach to try and use their oldest vaccines first.
Vaccine expiration dates are based on information from drugmakers on how long the shots stay at the right strength. J&J said the FDA added six weeks based on data from ongoing studies assessing the vaccine’s stability.
The FDA has been reviewing expiration dates on all three U.S. authorized vaccines as companies have continued to test batches in the months since the shots first rolled out. Vaccines from Pfizer and Moderna, authorized in December, have a six-month shelf life.
The country averaged about 800,000 new injections per day last week. That’s down from a high of nearly 2 million daily shots two months ago.
As vaccinations have slowed it’s become clear the United States is unlikely to meet President Joe Biden’s goal to have 70 percent of adults partially vaccinated by July 4. Roughly 64 percent of Americans older than 18 have had at least one dose, according to the Centers for Disease Control and Prevention.
Use of J&J’s vaccine has been hurt by links to a rare blood clot disorder. That issue led U.S. health officials to “pause” use of the shot for an 11-day review. Officials lifted the hold in late April after concluding that the vaccine’s benefits outweighed its risks
J&J’s rollout has also been slowed by contamination problems at a Baltimore factory that helps make the shots. The facility was shuttered after an FDA inspection uncovered unsanitary conditions and other problems in April. None of the vaccines made there have been distributed.