I do think, anytime you can introduce additional strains or variants into a vaccine, the human body's immune response tends to be a little bit broader and more durable and potentially longer-lasting.

Michael Chang

Michael Te-pei Chang (born February 22, 1972) is an American former professional tennis player and coach. He is the youngest man in history to win a singles major, winning the 1989 French Open at 17 years and 109 days old. Chang won a total of 34 top-level professional singles titles, (including seven Masters titles) was a three-time major runner-up, and reached a career-best ranking of world No. 2 in 1996. Since he was shorter than virtually all of his opponents, he played a dogged defensive style utilizing his quickness and speed. In 2008, Chang was inducted into the International Tennis Hall of Fame. He has coached Kei Nishikori since 2014.

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