What is the Spike protein? How it behaves in front of viral infections? Which is the importance’s vaccines? We are to confront with a new  deadly virus ( Covid-19) which is the Mondial fear with the start of new decade. For fighting the  pandemic virus , the researchers are identified  the structure from Spike protein responsible by virus Sar, Covid-19. The Spike protein consents to enter into human cellules the new virus. Having a tridimensional structure is more easy to link at superficies from cellules visible under the form of points ( corona) of microscope’s  imagine. One times entered in human organism they product the process of infection linked to receptors from cellular membranes with which the virus to spread attacking and infecting the immune system. The technics which consent to observe and studying the structure of  Spike protein are crystallography to rays X and criomicroscopia electronic.  Pour make and development the new medicaments is important knowing the structure, the characteristics from Killer viral protein in way of blocking and neutralizing the infection. Knowing the structure the researchers manage for synthetization the composts that blocking the diffusion and the cycle of vital  life by virus.  In same way they studying the structure  we know the division to Spike cellules. The first part starting with S1 which has a zone what use to linked  to target cellules  with the receptors ACE2.Second part subdivided  consents to enter the virus into cellules. All medicaments and vaccines puts in study are for neutralizing the Spike protein. The vaccinations active the immunity system creating the copy of Spike proteins carrier of genetic information with the scope of formation the antibodies for eliminating the virus.