There have been a further 133 cases of COVID-19 in Wales, bringing the total number of confirmed cases in the country to 18,514.
Public Health Wales said no further deaths had been reported, with the total number of deaths since the beginning of the pandemic remaining at 1,597.
Dr Giri Shankar, of PHW, said: “We are concerned about the significant rise in positive coronavirus cases in the Caerphilly area in recent days.
“It is absolutely vital that everyone in the community abides by social distancing measures – that is, by self-isolating when asked to do so, keeping 2m away from others outside your household, and washing hands regularly.”