According to the WHO, 2.5 billion people are at risk from the four major types of dengue virus, which is transmitted to people from infected mosquitoes.
In the sentence, what does 'which' refer to, 'the four major types of dengue virus' or 'dengue virus'?
' dengue virus. We know this because of the singular verb 'is'. .
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what does 'which' refer to, 'the four major types of dengue virus' or 'dengue virus'?' dengue virus. We know this because of the singular verb 'is'.
. . . dengue virus, which is transmitted . . .
. . . the four major types of dengue virus, which are transmitted . . .