Results with past epidemics
Passive immunization techniques have been in use for about a century. With PT, other Sars-cov-2-like epidemics, such as those caused by the severe acute respiratory syndrome (SARS-CoV) coronavirus (7), for MERS-CoV (8), avian influenza A(H5N1)(9) virus and influenza A(H1N1)(10), have already had excellent results. In these epidemics similar in some clinical and pathological aspects to that of Sars-Cov-2, in patients with PT administration there was a reduction in mortality and a faster recovery.