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For years now, scientists have tried to develop a safe and effective dengue vaccine. The challenge however, is that there are four different types of dengue viruses, and a common vaccine must protect against all of them. Some vaccines developed in other countries have shown mixed results, but are not widely used

For years now, scientists have tried to develop a safe and effective dengue vaccine. The challenge however, is that there are four different types of dengue viruses, and a common vaccine must protect against all of them. Some vaccines developed in other countries have shown mixed results, but are not widely used