Most virulent dengue fever strain is -: (A) 1, (B) 2, (C) 3, (D) 4
Answer is B. 4 types of dengue virus exist. DEN1,DEN2,DEN3,DEN4,in which 2 is more virulent REF:ANANTHAN ARIYANAM of your TEXT BOOK OF MICROBIOLOGY 9EDITION PGNO.523