Mae’r rhif R rhwng 1.1 - 1.4 ar hyn o bryd, gan olygu bod twf cyflymach a chyflymach yn nifer yr achosion, ac mae’r gyfradd amlder dreigl saith diwrnod ar gyfer Cymru hefyd yn fwy na 130 o achosion fesul 100,000 o’r boblogaeth.
The R number is currently between 1.1 and 1.4, meaning continued exponential growth in the number of cases and the seven-day rolling incidence rate for Wales stands at more than 130 cases per 100,000 population.