COVID-19 vaccine development
Overview on current vaccine studies against COVID-19 worldwide When the Europeans invaded the South American territories in the 16th century, they also brought infectious diseases from Europe into the newly conquered territories, with some disastrous consequences for the indigenous population living there [1]. The reason for this was a lack of immunity of the South American population against the foreign pathogens from Europe. Such a scenario impressively illustrates how important an existing immunity, acquired through natural exposure to the pathogen or , in modern times, through a