The Delta variant is far more contagious, more likely to break through the protection provided by the vaccine, and can cause more severe diseases than all the versions of the known virus, according to internal presentations by the US center for controlling and prevention of disease, namely the New York Times reported on Friday , The Delta variant is more contagious than a virus that causes Merers, SARS, Ebola, ordinary flu, seasonal flu, and smallpox, and it’s the same as the chickenpox, adds documents.