We are only able to do complex medical interventions and medical surgeries today because we have antibiotics, and we don't risk the patient dying the very next day from the bacterial infection that he might contract during the operation.
Só podemos realizar cirurgias e intervenções médicas complexas porque temos antibióticos e o paciente não corre o risco de morrer no dia seguinte de infecção bacteriana possivelmente contraída durante a operação.