Myxoviruses

Hemadsorption occurs at __________ (Temp.) and detachment at ________ (Temp.)

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Function of Neuraminidase

• Mediates hemadsorption

• Meditates hemagglutination

• Causes elution of cells adsorbed to virions

• Degrades mucus layer of respiratory tract

Which of the following does Influenza virus have ?

• ss -ve sense RNA

• ds DNA

• ss +ve sense RNA

• ss RNA diploid

Choose the group specific antigens in the following

• M1, M2 & M3

• RNP

• HA & NA

• NS1 and NS2

Changes in all antigenic sites of HA, resulting in a comletely different strain. What does this phenomenon result in?

• Antigenic drift

• Antigenic shift

• Antigenic reassortment

• Genetic drift

Does Influenza C cause human pandemics and epidemics?

• Yes

• No

Does viremia occur in influenza patients?

• YES

• NO

• YES, only primary viremia occurs

• Not known

What is the prominent symptom in case of influenza virus?

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Virus can be recovered in respiratory secretions for how many days?

• 4-10 days

• 3-4 says

• 3-8 days

• 7-12 days

Which of the following Abs are common in LRT secretions?

• IgM

• IgA

• IgE

• Secretory IgG