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Notre Dame offensive lineman Liam Eichenberg (74) plays against Pittsburgh during the first half of an NCAA college football game against Pittsburgh, Saturday, Oct. 24, 2020, in Pittsburgh.
Alabama defensive lineman Christian Barmore (58) celebrates a sack against Western Carolina during the first half of an NCAA college football game, Saturday, Nov. 23, 2019, in Tuscaloosa, Ala.
Florida quarterback Kyle Trask throws a pass during the first half of the team's Cotton Bowl NCAA college football game against Oklahoma in Arlington, Texas, Wednesday, Dec. 30, 2020.
Kentucky defensive back Kelvin Joseph (1), linebacker Jordan Wright (15), and Kentucky defensive back Tyrell Ajian (23) celebrate after a play during the second half of an NCAA college football game \against Georgia, Oct. 31, 2020, in Lexington, Ky.
Jamin Davis #44 of the Kentucky Wildcats celebrates a defensive stop against the North Carolina State Wolfpack during the TaxSlayer Gator Bowl at TIAA Bank Field on January 02, 2021 in Jacksonville, Florida.
EXPLORATORY STAGE | Discovery is the first stage in vaccine development. Research teams conduct intensive research on potential natural or synthetic antigens that may treat or prevent the disease. This exploratory stage typically lasts anywhere between two and four years. In the case of a potential coronavirus vaccine, multiple vaccines, including the <a href="/coronavirus/ct-nw-nyt-pfizer-covid-vaccine-20201109-jhekfi4hz5al5moppbzif7enti-story.html">Pfizer vaccine</a>, have rapidly moved through this phase and landed on a similar sort of treatment caused by the production of a viral protein called a spike.
Jeffri Chadiha, right, interviews Tulsa linebacker Zaven Collins, left, at NFL pro day Friday, April 2, 2021, in Tulsa, Okla.
LSU wide receiver Terrace Marshall Jr. plays against Vanderbilt in the first half of an NCAA college football game Saturday, Sept. 21, 2019, in Nashville, Tenn.
Tutu Atwell #1 of the Louisville Cardinals catches a pass and runs for a touchdown against the Florida State Seminoles at Cardinal Stadium on October 24, 2020 in Louisville, Kentucky.