Spain on Friday recorded 769 deaths due to the coronavirus over the past 24 hours, the highest single-day jump in the country since the outbreak began. 

In total, 4,858 people have died of the virus, known as COVID-19, with the total number of confirmed cases reaching 64,059, according to the country’s Health Ministry.

Spanish biologist José Antonio López Guerrero told Spanish broadcaster La Sexta that he estimates that there are probably 10-15 times more cases than the confirmed figures.

On Friday, the region of Madrid announced it would no longer be running COVID-19 tests on patients, who exhibit

Read more: Spain confirms 769 new coronavirus deaths