Mayor of California's Rancho Palos Verdes, John Cruikshank, and former Mayor Susan Brooks have both tested positive for the novel coronavirus, reported local media.

Cruikshank was among the city officials who attended a birthday party for Brooks on March 8 at Trump National Golf Club.

Other city officials have opted to self-quarantine for 14 days as recommended by the Centers for Disease Control and Prevention.

Ahead of the party, Brooks sent out a warning to the 65 guests planning to attend her 70th birthday party, asking invitees feeling under the weather with any flu-like symptoms to "please stay home and rest."

However, a week later, a man who'd been at the celebration had tested positive for COVID-19, as well as his wife. 

Now, five guests in all, including Brooks herself, have tested positive, while another 11 who have yet to be tested have reported being ill.