https://www.sciencenews.org/article...ail&utm_term=0_a4c415a67f-38d9bdeace-93298973
Bottom line is that it is not easy. There are four types of dengue alone, which means four separate vaccines just for dengue are needed.
Bottom line is that it is not easy. There are four types of dengue alone, which means four separate vaccines just for dengue are needed.