The results of a study conducted among 60,000 people showed that only 5% of the Spanish population
Collective immunity is achieved when enough people become immune to the virus to stop its spread.
The report said that the prevalence of antibodies to COVID-19 was below 3% in coastal regions, but higher in areas of Spain with widespread outbreaks.
Despite the great damage caused by COVID-19 in Spain,Prevalence estimates remain low and are clearly insufficient to ensure herd immunity, the study authors say. In this situation, social distancing measures and efforts to identify and isolate new cases and their contacts are essential to combating the epidemic in the future.
Currently this research isthe largest of its kind in Europe. Similar studies have been conducted in China and the US, and a key finding from these representative cohorts is that large portions of the population appear to have remained unexposed to the coronavirus, even in areas with widespread viral circulation.
Most of the population of Spain isseronegative for SARS-CoV-2 infection even in areas of hot spots. In most PCR-confirmed cases, detectable antibodies are detected. But in a significant proportion of people with symptoms compatible with COVID-19, a PCR test was not performed, and at least a third of serologically determined infections were asymptomatic. These results emphasize the need to maintain public health measures in order to avoid a new epidemic wave.
Spain now has more than a quarter of a million cases and at least 28,000 deaths.
Collective immunity can be achieved eitherby widespread vaccination, or in the case of infection with a sufficient number of people and recovery. If enough people are immune to the disease, it is unlikely that it will spread from person to person.
There is currently no vaccine for coronavirus, although hundreds are being developed.
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