Olympics officials on Sunday reported the first Covid-19 case among competitors in the Athletes Village where 11,000 competitors are expected stay during the Games.
Since July 2, Games organisers have reported 58 positive cases among athletes, officials and journalists.
"We're really kind of oblivious to that," Sermanni told reporters on Monday.
"We sort of follow our doctor who is extremely strict. We follow strict protocols and do everything we can to make sure we stay safe and healthy and hopefully, by doing that we'll be OK.
"So, I don't think... certainly I can only speak for myself, but I don't find that a distraction because we're just focusing on doing what we need to do."
The Football Ferns kick off their campaign against Australia on Wednesday before facing world champions United States and Sweden in Group G.
"Australia is one of the teams we're looking to target, to get a result," Sermanni said.
"We know we're going into a group against good teams... ranked higher than us in the world but the thing we need to do is be ready for game one. That's critical for our team.
"Obviously the Australian team is the one we know the best out of the three. We've got great familiarity with them and... if we can get our preparation and tactics right and everybody comes up on the day we can get a positive result."
