Spain's daily coronavirus death toll rose on Thursday to its highest in a week as authorities warned that a second wave of the outbreak was possible after a nationwide antibody survey showed about 5% of the population had contracted the virus.
The number of fatalities caused by the disease reported each day rose on Thursday to 217 up from 184 on the previous day, the health ministry said. The number rose above 200 for the first time since May 8.
The reasons for the increase are unclear, head of health emergencies Fernando Simon said. More than half of the new fatalities were reported in Catalonia alone.
"We are now working with the region to identify the date of the deaths and evaluate whether these are new fatalities or if there was a delay in the update," Simon said.
The overall death toll from the disease rose to 27,321, while the number of diagnosed cases rose to 229,540 on Thursday, although the antibody testing of 60,000 people across Spain had pointed to as many as 2.3 million people have had the disease.
The preliminary results have shown a 5% prevalence ratio in Spain's 47 million population, much below the levels needed to attain "herd immunity," which means a second wave of contagion is possible all over the country if the measures to stem the pandemic are not observed, Simon said.
Some studies have shown that a portion of people infected by the virus will show no symptoms but can still transmit the disease.
The Spanish study confirmed that the virus circulated more in the center of the country, which paid the highest price in fatalities.
In Madrid, the rate of infection was 11.3%, in Barcelona it was 7.1%, but only 2.3% in Seville, according to the study.
The Spanish government has so far released only the results of a first wave of "rapid tests" to determine the level of antibodies as a way to ascertain who has been infected.
Spain is one of the worst-hit countries by the pandemic. The number of daily fatalities has fallen dramatically over the past six weeks from a peak of 950 in early April. The strict lockdown imposed on the country, now being phased out, has helped to curb the contagion in the country.
The novel coronavirus has killed at least 294,199 people since the outbreak first emerged in China last December, according to a tally from official sources compiled by AFP on Wednesday.
At least 4,305,340 cases have been registered in 196 countries and territories worldwide. But those are likely only a fraction of the true number of infections because of low levels of testing.
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