The charges relate to valproate, a drug marketed as Depakine among other trade names, which studies say caused disabilities in about 15,000 to 30,000 children whose mothers took the medicine.
From the US to China, scientists are racing to develop a drug that can fight the deadly pandemic.
Initial vaccine tests focus on safety, and researchers in both countries are trying out different doses of different types of shots. Second phase allows vaccines to be tested to look for signs that they protect against infection.
French drug maker Sanofi had earlier revealed that Dengvaxia - the world's first dengue vaccine might increase the risk of severe disease in people who had never been exposed to the virus.
The country halts use of Dengvaxia vaccine after French pharma Sanofi says its drug might, in some cases increase risk of severe dengue in recipients not previously infected by the virus.
World Health Organization recommends Sanofi drug company's dengue vaccine in areas with high virus prevalence rates
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