The NCAA allowed colleges and universities nationwide to bring athletes back to campus for voluntary workouts as early at June 1.

More than a dozen schools have since reported more than three dozen positive cases of COVID-19 or the coronavirus as athletes arrive on campus.

» TIMELINE: Coronavirus cases on U.S. sports teams

There is no national standardized testing protocol for athletes.

Athletes are being tested for COVID-19 and coronavirus antibodies and given physical screenings through examines and questionnaires.

Georgia welcomed players back on the Athens campus on June 7 with workouts starting June 8. Coaches, however, are not allowed to  attend or direct the voluntary workouts, nor can they receive reports from the activity.

Georgia Tech athletes and staff, too, returned to campus June 7, with voluntary workouts expected to begin June 15. All athletes are to be tested for COVID-19 upon their arrival, though the first phase of the return has been limited restricted to those in the Atlanta area, as on-campus housing has yet to open. There also will be surveillance testing once training begins, as well as testing for athletes or staff who demonstrate symptoms. A contact-tracing plan will be put in place, also.

At Ohio State — home of former Georgia quarterback Justin Fields — ESPN reports, players must sign a waiver to acknowledge "they may be exposed to COVID-19 and other infections" before agreeing to return to campus. The school said every football player has signed the waiver and the university will not share cumulative testing information publicly.

Here’s a look at the cases reported among college teams since June 1:

June 1

Two Marshall football players and one staffer test positive for the coronavirus, the school announced, as voluntary football workouts restart at the Huntington, W.Va., campus.

The school said the three were asymptomatic and had not taken part in activities yet, as players returning to campus are required to be self-isolated for seven days while receiving COVID-19 tests.

It is note believed the cases are related.

June 2

Oklahoma State linebacker Amen Ogbongbemiga says he tested positive for COVID-19 after he attended a protest in Tulsa, Okla.

Two other players, not identified, also test positive, according to the school.

Ogbongbemiga made the announcement in a Twitter post.

The 21-year-old Ogbongbemiga says he protected himself during the protest over racial injustice and police brutality, following the death of George Floyd under Minneapolis police custody.

» COMPLETE COVERAGE: Atlanta protests

“Please, if you are going to protest, take care of yourself and stay safe,” he wrote.

June 4

Seven Arkansas State University student-athletes test positive for the coronavirus, according to the Jonesboro, Ark., school. The students, who are athletes across three sports, went into self-isolation for 14 days.

June 8

Three Auburn football players test positive for the coronavirus, WSFA reported. The players were tested Friday, June 5, as part of the team's plan to bring student athletes back to campus for practice.

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Texas Tech reports positive tests for COVID-19 within the men’s basketball program. The Lubbock, Texas, school would not reveal the number of players, but says they were in isolation.

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The University of Iowa says that one of 237 tests among students, coaches, and staff returns positive for COVID-19.

June 9

Multiple student-athletes at Boise State University test positive for COVID-19 after some teams started returning to the Idaho campus for workouts.

Citing privacy laws, the university declined to say how many or what sport those athletes played, the Idaho Statesman reported. Members of the football and women's soccer team returned to campus last week.

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At least one player on the Florida State football team tests positive for COVID-19. The Tallahassee, Fla., school cited privacy laws in providing specifics on the exact number of players testing positive.

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Three UCF football players in Orlando test positive for COVID-19 after returning to campus for voluntary workouts, the school reported.

The three Knights players — among the initial group of 60 players allowed back for workouts — were isolated for two weeks.

June 10

Two Texas football players test positive for coronavirus while a third tests positive for the COVID-19 antibody.

Texas brought in 58 players to the Austin campus that is otherwise closed to students. One of them presented symptoms during pre-screening and was tested before arriving. The other two were tested during the on-campus screening process.

All went into self-isolation.

June 11

Five Alabama Crimson Tide football players test positive in the first round of coronavirus testing conducted Friday, June 5, at the Tuscaloosa campus. Six days later, three more Crimson Tide players test positive for the virus in the second round of testing bringing the total number of players in quarantine to eight.

June 12

Two Clemson football players and a men’s basketball player test positive for the coronavirus, the South Carolina school reported.

Clemson conducted 128 tests on football and basketball players after players on those teams resumed voluntary in-person workouts.

those players testing positive and their possible contacts will be isolated.

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The University of Houston suspends all voluntary workouts on campus after six test positive for COVID-19, with symptoms. Houston reopened its facilities on June 1.

June 13

Iowa State University confirms 10 student athletes, including two on the football team, test positive for COVID-19. None, the Ames, Iowa, school says were participating in team activities.

June 16

A football player at West Virginia tests positive for the coronavirus, the school said on the first day of voluntary workouts.

The school’s athletic department said in a statement that contact tracing identified other football players who could have been exposed to the athlete. Both the player who tested positive and the others he may have been in contact with will isolate themselves for 14 days, the statement said.

June 19

Clemson reports that 28 people — 23 of them on the football team — were found with COVID-19 since testing began for athletes and other personnel on June 8. The school said all were asymptomatic and in isolation for at least 10 days. No one has been hospitalized.

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Kansas State paused workouts after 14 of the 130 athletes tested have tested positive for the coronavirus.

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At least one-quarter of LSU's football team was in quarantine, according to Sports Illustrated, after 30 of the 115 players on the reigning college football championship team heave either tested positive for COVID-19 or were found to have had contact with those who tested positive.

June 22

Two Wisconsin student athletes tested positive for COVID-19 during initial on-campus testing in Madison, Wis.

June 29

Austin Peay has suspended voluntary workouts and closed its facilities after a cluster of positive tests for the coronavirus among its athletes. The Governors currently have 11 athletes who have tested positive. The FCS-level school in Clarksville, Tenn., did not identify the sports involved.