Coronavirus vaccine stocks skyrocketed last year. Players like Novavax(NASDAQ:NVAX) and Vaxart scored the biggest wins, each climbing more than 1,500%. Investors placed bets on the companies most likely to bring a vaccine to market -- or make a splash with innovative technology.

These days, three vaccines have entered the market -- from Pfizer, Moderna(NASDAQ:MRNA), and Johnson & Johnson. We're no longer betting on which companies will make it to the finish line first. But that doesn't mean the opportunity to invest in coronavirus vaccine stocks is over. Far from it.

Two things are set to drive massive gains in these stocks over the long term. What are they? Product revenue and the development of newer vaccines or boosters to handle emerging coronavirus strains. And two stocks are likely to deliver both in the coming months and years, so an investment in them could double your money.

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