Infectious diseases are still a major cause of death in the world.
And in the US they are acquired 2 ways overwhelmingly
#1. Hospitals and healthcare facilities.
#2. Drugs and promiscuous sex.
In the civilized world, the rate of serious infectious disease outside #1 and #2 is extremely low.
#1 In the civilized world, as everywhere else, the primary route of infection is contact or close proximity to infected people, or contact with insects that carry disease. You do not have to be anywhere near a hospital to get an infectious disease.
#2 While the behavior of addicts might cause them to forego basic hygiene measures, drugs do not cause infectious disease. In addition, most infectious diseases are not STDs.
For your reading pleasure, you can look up the CDC’s weekly compendium of infectious disease deaths.
Morbidity and Mortality Weekly Report (MMWR) at https://www.cdc.gov/mmwr/index.html.
https://wonder.cdc.gov/nndss/static/2018/23/2018-23-table1.html