Salud
Los CDC no encuentran viruela en viales congelados sospechosamente etiquetados como «viruela»
Días después de que un laboratorio de Pensilvania fuera cerrado porque un trabajador descubrió viales etiquetados como «viruela» en un congelador, los CDC dicen que no hay razón para temer un brote viral. A última hora de la noche del jueves, los funcionarios federales anunciaron que los viales no contenían el virus variólico mortal y erradicado. En cambio, tenían un virus relacionado pero mucho más domesticado, uno que se usa para crear vacunas contra la viruela.
A principios de esta semana, los Centros para el Control y la Prevención de Enfermedades revelaron que un trabajador de laboratorio había descubierto los viales congelados mientras limpiaban un congelador en una instalación de investigación de vacunas de Merck con sede en Pensilvania que trabaja con los CDC. Había 15 viales en total, cinco de los cuales estaban etiquetados como «viruela» y otros 10 etiquetados como «vaccinia», informa el New York Times, citando a un funcionario local. Luego, los viales se transfirieron a otro lugar para realizar pruebas el miércoles. Y ahora resulta que los viales de «viruela» también contenían el virus vaccinia.
“No hay evidencia de que los viales contengan el virus variólico, la causa de la viruela”, el C.D.C. dijo en un comunicado enviado el jueves al New York Times.
Vaccinia es un virus con una historia de fondo intrigante. Edward Jenner desarrolló las primeras vacunas contra la viruela a fines del siglo XVIII, utilizando lo que él creía que era la viruela vacuna, un primo de la viruela que causa una enfermedad menos grave en los humanos (la viruela mató al 30% o más de sus víctimas). Sin embargo, no está claro si las inoculaciones originales realmente contenían viruela vacuna, ya que el virus utilizado en las vacunas que se convirtieron en la base de los programas de vacunación masiva terminó siendo la vacuna, que se parece mucho a la viruela vacuna. La discrepancia no se detectó durante mucho tiempo, y nadie está seguro de si la vacuna evolucionó a partir de las primeras cepas de viruela vacuna cultivadas en laboratorio, a partir de otro virus relacionado llamado viruela equina o como un híbrido de varios virus de la viruela. Sus verdaderos orígenes siguen siendo un misterio, y no se cree que la vaccinia exista en la naturaleza. Una vez que se confirmó que era un virus verdaderamente distinto, la vacuna recibió el nombre de la tecnología por la que era conocida.
En cualquier caso, la vacunación con vaccinia es mucho menos dañina que contraer viruela, aunque la inyección a menudo puede dejar una cicatriz característica en la piel en el lugar de la inyección. Las probabilidades de que alguien estuviera expuesto al contenido de los viales del congelador eran bajas, dijeron los CDC, ya que se dejaron intactos al ser descubiertos y, según los informes, el trabajador del laboratorio llevaba una mascarilla y guantes en ese momento.
Hace poco más de cinco años, los trabajadores de laboratorio de los Institutos Nacionales de Salud se encontraron con un alijo de muestras de viruela, algunas de las cuales contenían virus viables. Y aunque solo hay dos sitios autorizados en los EE. UU. Y Rusia donde se puede mantener la viruela para su estudio, los científicos sospechan que hay algunas reservas ocultas en otros lugares. Por ahora, sin embargo, no existe un riesgo inmediato de una secuela de la viruela.
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