Patents are just one part of the vaccine puzzle. The key is the know-how about the actual manufacturing process.
The figure is slightly lower than the $19.50 per shot the United States agreed to pay for its first shipment of 100 million doses of the same vaccine.
The two companies said they planned to launch another study next year, hoping to come up with a more effective vaccine by the end of 2021.
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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