Mae tystiolaeth gynyddol o brofiadau pobl yn dangos bod nifer bach ond sylweddol o bobl sy’n dal COVID-19 yn araf i adfer o effeithiau’r feirws, yn aml fisoedd ar ôl iddynt ddechrau teimlo’n sâl. Mae rhai amcangyfrifon yn awgrymu y gallai tua 1 o bob 5 o bobl sydd wedi dal COVID-19 barhau i fod â rhai o’r symptomau dros dair wythnos ar ôl cael eu heintio; a gallai 1 o bob 10 o bobl deimlo effeithiau dri mis, neu fwy, ar ôl yr haint cychwynnol.
Increasing evidence and testimony from people’s experiences shows that a small, but significant number of people who contract COVID-19 are slow to recover from the effects of the virus, often months after initially falling ill. Some estimates suggest that approximately 1 in 5 people affected by COVID-19 may still experience different groups of symptoms more than three weeks after infection; and 1 in 10 people could still be affected at three months, or longer, after initial infection.