“I blame the @NFL for not holding themselves accountable,” Kelly — who underwent a 12-hour brain operation to remove a brain tumor last year — continued in her post. "These are people’s lives and livelihoods that are in those results in THEIR test sites. Maybe we should be absolutely positive a person has covid before releasing that info to the world. I’m sharing our experience because I don’t want it happening to any other family that plays for this league.”

The NFL did not immediately respond to PEOPLE's request for comment.

According to Harvard Health, there are many factors in play when it comes to obtaining an accurate coronavirus test. For PCR tests — the kind where a swab is inserted into the nostril to gather a test sample — results could be affected by the condition the test was transported in to the laboratory. But results can also be affected by the timing of when the test was taken.

The FDA says false-positive results are possible and may occur for various reasons, such as an antibody test detecting a different coronavirus other than the one causing the current pandemic (SARS-CoV-2).

"We are thankful for all those you called, texted, emailed and showed concern for Matthew and our family," Kelly said in her Instagram. "Your Thoughts during this strange, difficult time are greatly appreciated … but we are all absolutely fine and feeling great. Thank God for that."

Coronavirus continues to be a major issue for the country five months after leading to a nationwide lockdown. The United States has seen more than 4.7 million cases and 157,302 deaths from the virus as of Wednesday afternoon, according to the New York Times.

As information about the coronavirus pandemic rapidly changes, PEOPLE is committed to providing the most recent data in our coverage. Some of the information in this story may have changed after publication. For the latest on COVID-19, readers are encouraged to use online resources from CDC, WHO, and local public health departments. PEOPLE has partnered with GoFundMe to raise money for the COVID-19 Relief Fund, a GoFundMe.org fundraiser to support everything from frontline responders to families in need, as well as organizations helping communities. For more information or to donate, click here.

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