Final answer:
The incidence of STIs in the US is now more than 20 million cases per year.
Step-by-step explanation:
The incidence of STIs in the US now is more than 20 million cases per year.
STIs are a significant public health concern in the United States, with high rates of chlamydia, gonorrhea, and syphilis. Chlamydia, for example, is the most common STI in the US, with an estimated prevalence of 3.1% among women ages 14-49.
It is important to note that the actual incidence of STIs may be higher than reported, as many cases go undiagnosed or unreported due to the lack of mandatory reporting and social stigmas.