
Estudio de los infectados
Son personas “con alta sensibilidad” para la transmisión de la enfermedad. También encontraron una cepa “una cepa asiática que apenas entró en ningún otro país europeo”.

La estación del metro de Madrid en el aeropuerto de Barajas, una de las puertas de entrada de turistas de todo el mundo. (Foto: Bloomberg)
Con sus 940 mil metros cuadrados, el aeropuerto Adolfo Suárez Madrid Barajas es uno de los más grandes del mundo y una de las puertas de entrada de turistas. Quizás eso permita explicar el reciente descubrimiento de científicos españoles que identificaron una “cepa asiática” de coronavirus que apenas entró en otros países europeos pero sí en España.
Según el profesor Antonio Salas, coordinador de la investigación que dio a conocer este jueves la Universidad de Santiago de Compostela, el escenario en España es “un tanto particular” en el contexto europeo respecto al coronavirus, ya que entraron las primeras cepas del virus que afectaron a casi toda Europa, pero además llegó “una cepa asiática que apenas entró en ningún otro país europeo”.Newsletters Clarín Coronavirus en la Argentina

El equipo analizó casi 5.000 genomas del coronavirus, que en términos de código genético del virus suponen aproximadamente 150 millones de letras, y la investigación apunta que la evolución natural que tuvo el virus no es compatible con una manipulación en laboratorio, “basadas exclusivamente en teorías ‘conspiracionistas’ sin argumento científico”.
El hallazgo “más sorprendente y novedoso” del estudio, sin embargo, fue demostrar la existencia y el impacto en la pandemia de personas con alta sensibilidad para transmitir el virus, conocidas como “supercontagiadores”.

Hasta el momento, esa figura “se había discutido en los medios y desde un punto de vista epidemiológico”, pero ahora los investigadores demostraron con pruebas su existencia, concluyendo que entre un tercio y la mitad de los infectados por COVID-19 en el mundo estarían relacionados con los “supercontagiadores”.
Además, corroboraron que el origen de todas las cepas actuales del coronavirus se sitúa “no antes de noviembre de 2019”. Y sugieren que en la primera onda epidémica asiática debieron existir muchos más casos de los que reportaron las autoridades sanitarias nacionales de esa región.

“Este es un paso fundamental para entender el proceso de dispersión del virus, así como para tratar de prever y prevenir futuros brotes y pandemias, tanto de coronavirus u otros patógenos con potencial igualmente letal o incluso superior”, argumentó Salas.
La cifra global de casos confirmados de coronavirus superó este jueves los 5 millones, seis meses y medio después del origen de la pandemia en China, mientras que en las últimas 24 horas hubo un récord mundial de nuevos contagios en un día, según la OMS y la base de datos de la Universidad Johns Hopkins, de Estados Unidos.
Estados Unidos resulta el país más afectado, con más de 1,55 millones de infectados y más de 93.000 muertes por el virus de los más de 328 mil. Detrás, en número de casos, se ubican Rusia, con más de 300.000, y Brasil, Reino Unido, España e Italia, con más de 200.000 casos cada uno.
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