The number of sexually transmitted infections (STIs) around the world is increasing and is a “major concern” for health officials, according to a new report published Tuesday from the World Health Organization (WHO).

The report found four curable STIs — chlamydia, gonorrhea, syphilis and trichomoniasis — are responsible for more than 1 million infections daily among adults between ages 15 and 49. Cases of syphilis, in particular, have been rising rapidly.

The number of new syphilis cases among adults between ages 15 and 49 increased from 7.1 million in 2020 to 8 million in 2022, according to the report.

There have also been increases in the rate of congenital syphilis, which occurs when a baby is born with the infection after the mother passed it on during pregnancy. Between 2020 and 2022, the rate per 100,000 live births per year rose from 425 to 523.

The global trends mirror those seen in the United States. A Centers for Disease Control and Prevention report released earlier his year found the total number of syphilis cases increased more than 17% to 207,255 between 2021 and 2022, reaching the greatest number of cases reported since 1950.

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