The 22-year-old goalkeeper - who initially tested negative days before his positive test - was asymptomatic, and the Cherries boss admitted he was anxious after the news.
He told the Daily Mail newspaper: "I imagine anxiety is there among the players. I can only imagine they are feeling the same way as I am."
Ramsdale is one of eight people - including players and staff - to test positive from the Premier Premier League thus far.
Howe - who was the first top flight manager to take a pay cut amid the coronavirus pandemic - acknowledged that the positive test "changes the mindset of everybody" at the club.
He explained: "There was not one positive within our group during the early stages and we were comfortable and felt OK. But as soon as you get that one positive test, that changes the mindset of everybody.
"Suddenly everyone feels vulnerable, everyone is alerted to the fact that this is serious and real.
"Then the unknown comes into play. That shook us. We are now waiting for our next testing times to see if anyone else was in contact with the player."