Some Republican lawmakers said Sunday that they will self-quarantine after discovering they interacted with an individual at last month’s Conservative Political Action Conference who later tested positive for the coronavirus.

Sen. Ted Cruz (R-Texas) first announced his decision to self-quarantine in light of the news. Rep. Paul Gosar (R-Ariz.) followed suit, adding that three of his staff members will also quarantine themselves. It’s unclear how many lawmakers interacted with the individual.

“Last night, I was informed that 10 days ago at CPAC I briefly interacted with an individual who is currently symptomatic and has tested positive for COVID-19,” which is the disease caused by the virus, Cruz said in a statement, adding that the interaction involved a handshake and a “brief conversation.”