Which of the following viruses is hemagglutinin-positive?
A. influenza A
B. influenza B
C. parainfluenza
D. A & B
E. A, B, C
Answer: E
Which of the following viruses is hemagglutinin-positive?
A. influenza A
B. influenza B
C. parainfluenza
D. A & B
E. A, B, C
Answer: E