Below is a table of causes of death in the Hiwi hunter-gatherers of Venezuela (from this paper). Note that infectious disease counts for more than half of deaths in most demographics, equalled by birth problems in infants. I think the main components of infectious disease are:That is not true (are you accounting for violent death and infant mortality?).
Really? Like what? Hunter-gatherers that eat cheeseburgers don't count.
1 - Diarrhea, mostly prevented by hygiene and antibiotics
2 - Viral diseases such as measles, mostly prevented by vaccination
3 - Tooth decay, mostly prevented by oral hygiene and preventative dentistry
4 - Respiratory infections (mostly pneumonia), mostly prevented by antibiotics
Also note that 21% of women who died between the ages of 10 and 39 died in childbirth. This is prevented in modern societies by preventative medicine, organised and trained midwifery with some input from the more high tech treatments. These will also impact child neonatal survival.
Spoiler :
This is just one tribe. The overall death rate with 4 others is compared here, there are differences but none are exactly great.