A Previously Healthy 8-Year-Old Boy Is Infected with an Upper

question 12

Multiple Choice

A previously healthy 8-year-old boy is infected with an upper respiratory tract virus for the first time.During the first few hours of infection,which one of the following events occurs?

• A)The adaptive immune system responds rapidly to the virus and keeps the viral infection under control.
• B)The innate immune system responds rapidly to the viral infection and keeps the viral infection under control.
• C)Passive immunity mediated by maternal antibodies limits the spread of infection.
• D)B and T lymphocytes recognize the virus and stimulate the innate immune response.
• E)The virus causes malignant transformation of respiratory mucosal epithelial cells,and the malignant cells are recognized by the adaptive immune system.