California Governor Gavin Newsom said the state is currently monitoring an estimated 8,400 people who arrived in California on commercial flights from Asia over COVID-19 concerns. The state currently has 28 confirmed cases of the novel coronavirus, including people who were repatriated from China and the Diamond Princess cruise ship in Yokohama, Japan, as well as recent travelers to mainland China, and one of their spouses. Five additional individuals who had been repatriated to California had positive tests and were quarantined but have since recovered and returned to their home states, Newsom said Thursday during a news conference. On Wednesday, the Centers for Disease Control and Prevention (CDC) confirmed that the first patient in the U.S. diagnosed with COVID-19 who had not been to China or been in contact with another known case is in Northern California, indicating that community spread of the virus may be possible in the U.S. "We knew this was inevitable," Newsom said. He also said the state has an inadequate supply of testing kits for both surveillance and for diagnostic purposes, but the CDC has assured him that more tests are coming. "We need to substantially increase access and availability to testing, and we need to do that today," he said. New York City Mayor Bill de Blasio made similar comments about testing on Wednesday. "Right now the CDC posture is they are letting perfect be the enemy of good," he said. "We believe that if they would empower local laboratories, we could work with them to do high-quality testing faster."