In 2018 – the most recent stats available – 2.5 million had an active sexually transmitted infection. This includes almost 1.8 million with chlamydia, nearly 600,000 with gonorrhea and 115,000 cases of syphilis, both primary and congenital (passed from infected mother to baby).

What percent of the population has an STD?

CDC estimates indicate about 20 percent of the U.S. population – approximately one in five people in the U.S. – had an STI on any given day in 2018, and STIs acquired that year will cost the American healthcare system nearly $16 billion in healthcare costs alone.

How many people on earth have an STD?

On average, approximately 1 in 25 people globally have at least one of these STIs, according to the latest figures, with some experiencing multiple infections at the same time. STIs spread predominantly through unprotected sexual contact, including vaginal, anal and oral sex.