Q 01/05
A) About 12
B) Well over 200
C) About 1,000
D) About 50
Answer · why
That variety, plus rapid mutation, is why no vaccine exists.
Q 02/05
A) Respiratory syncytial viruses
B) Parainfluenza viruses
C) Adenoviruses
D) Rhinoviruses
Answer · why
They have more than 100 known serotypes; the cause of 20 to 30 percent of colds remains unidentified.
Q 03/05
A) Four to five
B) Six to eight
C) One or two
D) Two to three
Answer · why
Children average six to eight, and infections cluster in winter.
Q 04/05
A) Within about 16 hours
B) After 5 days
C) After 2 weeks
D) Within 2 hours
Answer · why
They usually peak two to four days after onset and clear within seven to ten days.
Q 05/05
A) 18 days
B) 7 days
C) 12 days
D) 3 days
Answer · why
In children the cough lasts more than 25 days in about one case in ten.
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