Sexually transmitted infections (STIs) continue to pose serious public health concerns worldwide. These infections can lead to a range of health complications, including infertility, chronic pain, birth complications, and in some cases, death.
They also contribute to long-term physical and emotional distress for millions of individuals each year.
Globally, the spread of STIs remains alarmingly high. Millions of new cases are recorded annually, with infections such as chlamydia, gonorrhoea, syphilis, and trichomoniasis making up the bulk of new diagnoses.
Viral infections like herpes, HIV, hepatitis B, and human papillomavirus (HPV) are also widespread and can have lifelong consequences if left untreated.
STIs are primarily transmitted through sexual contact but may also be spread from mother to child during pregnancy or childbirth, through blood transfusions, or via non-sterile medical instruments. The root causes vary, with bacteria, viruses, and parasites all contributing to the global burden.
In 2025, new data from Data Pandas highlights regional differences in STI prevalence. Southern African nations such as South Africa, Botswana, and Lesotho report the highest infection rates globally.
Interestingly, countries with relatively high income levels, like Bermuda, also appear among those with the highest rates when adjusted per 100,000 people.
On the other end of the scale, many South Asian and Middle Eastern countries report significantly lower infection rates.
This could reflect the influence of cultural norms, effective public health policies, or limited reporting due to stigma or weak health systems.
The following list ranks the 15 countries with the highest STI rates in 2025 based on the latest available data.
Countries with the Highest Cases of Sexually Transmitted Infections
Country
STD Rate (per 100k)
- South Africa
37,273
- Botswana
34,106
- Lesotho
32,472
- Bermuda
32,365
- Brazil
31,746
- Gabon
31,452
- Barbados
30,969
- Puerto Rico
30,911
- Eswatini
30,866
- Cuba
30,770
- Namibia
30,535
- Jamaica
29,583
- Saint Lucia
29,562
- Trinidad and Tobago
29,263
- Republic of the Congo
29,262
