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BUSINESS INSIDER: Do J&J vaccine takers need boosters? What we know about mixing shots. Some people who got the J&J vaccine are seeking mRNA booster shots. The CDC and FDA don't recommend mixing vaccines, but experts say it can't hurt. Early data on mixing vaccines suggests it could trigger a stronger immune response. See more stories on Insider's business page.

Some experts say J&J vaccine recipients should get an mRNA booster. Here's what we know about mixing shots. The CDC and FDA don't recommend mixing vaccines, but some experts have done it, and say we shouldn't wait for data on this.