Rep. Ben McAdams of Utah announced that he tested positive for COVID-19 on March 18, shortly after Diaz-Balart's announcement.
Rep. Ben McAdams of Utah, the state's only US House lawmaker in the Democratic Party, is the second lawmaker to test positive for the coronavirus.
He said he experienced "mild cold-like symptoms" upon his return from Washington, DC, and got tested shortly thereafter.
"I am still working for Utahns and pursuing efforts to get Utahns the resources they need as I continue doing my job from home until I know it is safe to end my self-quarantine," McAdams said in his statement. "I'm doing my part as all Americans are doing to contain the spread of the virus and mitigate the coronavirus outbreak."
Republican Sen. Rand Paul of Kentucky announced that he tested positive for the virus on March 22.
Republican Sen. Rand Paul of Kentucky tested positive for COVID-19, his office said in a tweet on Sunday. Paul is the first US senator to test positive.
"He is feeling fine and is in quarantine," Paul's office said. "He is asymptomatic and was tested out of an abundance of caution due to his extensive travel and events. He was not aware of any direct contact with any infected person."
Paul published an op-ed in The Hill earlier this week calling for "aggressive but prudent actions" to combat the rapid spread of the disease.
President Donald Trump and Vice President Mike Pence have tested negative for COVID-19.
Trump and Pence have been tested for the disease and have tested negative, according to the White House.
Katie Miller, Pence's press secretary, tweeted on March 21 that both Pence and Second Lady Karen Pence have tested negative for COVID-19.
The White House physician said on March 13 that Trump tested negative for the disease after dining with the Brazilian delegation at his Mar-a-Lago club. Trump came in contact with two individuals who were later confirmed to have the disease.