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About 400,000 Americans may have sexually transmitted disease chlamydia, but they might not be aware about it, according to a new report.

The report estimated that nearly 1.8 million people in United States are suffering from chlamydia but only 1.4 million infections have been reported. 

According to the report, women and particularly young women seemed to have greater risk of harboring this often symptomless infection.

In the report, researchers analyzed data from 2007 to 2012 National Health and Nutrition Examination survey and found that 1.7 percent of men and women aged 14 to 39 have chlamydia which makes to count to 1.8 million. However, only 1.4 million chlamydia are reported each year, researchers added. 

Researchers found that the chlamydia infection rate is highest among sexually active girls aged 14 to 19, at 6.4 percent. Contrastingly, the rate among sexually active boys aged 14 to 19, was found to be just 2.4 percent. 

Researchers also noted a significant racial differences. The rate among sexually active black teen girls is 18.6 percent, compared with 3.2 percent among sexually active white teen girls, researchers said. 

Researchers added that it was important that all sexually active teen girls get screened in order to ensure that all those who are infected get diagnosed and treated. 

The study has been presented at STD Prevention Conference in Atlanta.