In Spain, one of the hardest-hit countries in the pandemic, the coronavirus spread quickly and widely without being detected, especially among the elderly, experts said.
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While they stressed it was too early to carry out a detailed analysis, the experts pointed to the country's sociable lifestyle and close ties between young and older family members as significant factors in the virus's spread.
Low mortality, high spread
While Spain has the world's highest coronavirus death toll per capita after Belgium, its mortality rate — the percentage of infected patients who die — stands at 10.4 percent, below other hard-hit nations like Italy, France and Britain.
"The problem here is the size of the epidemic, the great quantity of infections which we had at the epidemic peak," said Fernando Rodriguez, a public health professor at Madrid's Autonomous University.
Only the United States has more confirmed COVID-19 cases than Spain, although national variations depend greatly on the number of tests that are carried out.
A woman walks her dog in front of the Royal Palace in Madrid. AFP
A study carried out by the Polytechnic University of Catalonia estimated that more than two million of Spain's 47 million people are infected.
Late detection
The virus "circulated under the radar a lot" before the government ordered a near total nationwide lockdown on March 14, said the head of epidemiology at Barcelona's Hospital Clinic, Antoni Trilla.
Unusually warm weather helped spread the virus.
"The weather was fantastic during the last weeks of February and the first week of March and people were out on the streets, very close to one another," said Rodriguez.
This sped up the spread of the virus and "in very little time there was community transmission," he added.
Kisses and hugs
Lifestyle could also have played a role in a country where people spend a lot of time outside in groups eating out, having drinks, attending religious processions, protesting or just going for a walk.
A healthcare worker looks down while they assist a COVID-19 patient. AFP
In Spain, as in Italy, "people hug and touch each other a lot, here people are constantly kissing, even at work," said Ildefonso Hernandez, a professor of public health at the Miguel Hernandez University in Alicante.
In addition, Spain has the most people living in flats of any European Union country, according to EU statistics agency Eurostat.
Close contact with seniors
While Spaniards have a long average lifespan and the country has a high number of seniors who are more vulnerable to the virus, its share of the population over 65 is lower than other nations that have suffered fewer COVID-19 deaths, such as Germany.
But older people in Spain have more contact with younger family members who can pass on the virus to them, Ildefonso Hernandez said.
"Older people in northern Europe are more secluded and there is more family distance," he said.
A woman walks by the Royal Palace in Madrid. AFP
In Spain, families "are much tighter, the interaction between youths and seniors is very high," he added.
Nursing homes
Families also frequently visit relatives who live in nursing homes, which became tragic focal points of the pandemic in Spain, Hernandez said.
The health ministry does not provide figures for the number of deaths from COVID-19 at nursing homes.
But the governments of the two hardest-hit regions, Madrid and Catalonia, reported a combined total of around 8,000 confirmed and suspected deaths from the disease at retirement homes.
Strained health care system
Spain's public healthcare system is ranked in the top 10 in the world by the World Health Organization (WHO), but it has suffered deep spending cuts since the global financial crisis more than a decade ago.
While it has a strong primary care network, hospitals have fewer beds than the European average, which forced them to improvise during the pandemic.
Like banks with little solvency "they did not pass the stress test," said Guillem Lopez-Casasnovas, an economist and expert on healthcare systems at Barcelona's Pompeu Fabra University who has worked as an advisor to the WHO.
"When you live day to day, you get the most out of what you have, but you don't have enough muscle to respond to a major stressor like now," he added.