The number is for total infections, not infected individuals, see quote from article.
“In general, CDC estimated the total number of infections in the calendar year, rather than the number of individuals with infection, since one person can have more than one STI at a given time (e.g., HPV and chlamydia) or more than one episode of a single STI (e.g., repeat chlamydia infection).”
The most common sexually transmitted infection in the United States in 2008 was human papillomavirus (HPV), which caused 14,100,000 estimated infections that year.
After HPV, in order of magnitude, according to the study, new STIs in the U.S. in 2008 included 2,860,000 new Chlamydia infections; 1,090,000 new Trichomoniasis infections; 820,000 new Gonorrhea infections; 776,000 new Herpes Simplex Virus Type 2 (HSV-2) infections; 55,400 new syphilis infections; 41,400 new HIV infections; and 19,000 new Hepatitis B infections.
The total of 110,197,000 existing STIs in the United States in 2008 included 79,100,000 HPV infections, 24,100,000 HSV-2 infections; 3,710,000 Trichomoniasis infections; 1,579,000 Chlamydia infections; 908,000 HIV infections; 422,000 Hepatitis B infections; 270,000 Gonorrhea infections; and 117,000 Syphilis infections.”
Fortunately, we now have the HPV vaccine, and cures for a number of these infections.
It's not like there's no choice. Chooz before you scrooz.
And that makes the > 110 million number pretty useless.
There is no way we know how often a certain infection recur in the same person.