The Thai Health Ministry has confirmed 21 locally transmitted cases of Zika infection in central Bangkok, local media reported Sunday.

According to the Japanese Embassy, no Japanese are among the cases, which were all recorded in the capital's Sathorn District, where many office complexes are located and where many Japanese commute.

Thailand recorded its first confirmed case of Zika in 2012. There were around 100 reported cases in the Southeast Asian country in the first half of this year.

According to local reports, among the 21 cases is a pregnant woman who recovered and gave birth successfully. She is suspected to have been infected by her husband, who recently returned from Singapore, where the number of Zika cases has topped 300.