Respuesta :
Until the recent past, which has evidently seen the development of very potent antibiotics, people were susceptible to infectious diseases including influenza, cholera, tuberculosis, HIV, tetanus, SARS, malaria, and skin diseases occurring due to Staphylococcus aureus.
I think the correct terms to fill in the blank would be diphtheria, tuberculosis, and smallpox. These three diseases are caused by bacterial infection and are some of the deadly diseases. Until the past century, people who survived into young adulthood and beyond we're nevertheless susceptible to death from infectious diseases such as the three mentioned above.