The History of Epidemiology - Is There Any Precedent?

The first, really extensive epidemiologi data that was published in pediotricon 20 leven by ruci gupta, shows that it was about eight % of the population under the age of 21. The incidente rate is going through the roof during a time when most public health indicators have been improving since te 19 forties. Is there any precedent for this? And the history of epidemiology, mean, the one thing i could think of is obesity, but that's not something with completely obscure roots.