Covid, a near-perfect virus. And therefore difficult to defeat

An almost perfect virus. Since it was isolated at the end of 2019 to today, Sars-Cov-2 has evolved becoming more and more capable of infecting, as evidenced by the highly contagious Delta variant. But behind this ability there are many mechanisms that make the virus, in spite of ourselves, really complicated to defeat. Here is everything we know – and we have yet to find out – about how Sars-Cov-2 manages to enter our cells, multiply and infect a new individual.