WASHINGTON — Moderna and the National Institutes of Health are in a bitter dispute over who deserves credit for inventing the central component of the company’s powerful coronavirus vaccine, a conflict that has broad implications for the vaccine’s long-term distribution and billions of dollars in future profits.The vaccine grew out of a four-year collaboration between Moderna and the N.I.H., the government’s biomedical research agency — a partnership that was widely hailed when the shot was found to be highly effective. A year ago this month, the government called it the “N.I.H.-Moderna Covid-19 vaccine.”The agency says three scientists at its Vaccine Research Center — Dr. John R. Mascola, the center’s director; Dr. Barney S. Graham, who recently retired; and Dr. Kizzmekia S. Corbett, who is now at Harvard — worked with Moderna scientists to design the ge …
