The estimated proportion of people who test positive for coronavirus (COVID-19) at a point in time, with or without symptoms, based on nose and throat swabs.
Yr amcangyfrif o’r gyfran o bobl sy’n cael canlyniad positif i brawf am y coronafeirws (COVID-19) ar adeg penodol, gyda symptomau neu hebddynt, yn seiliedig ar swabiau trwyn a gwddf.