RNA viruses (Influenza) Flashcards
what is the biology of Influenza A/B/C virus?
enveloped single stranded RNA segmented
what is the worst influenza virus?
type A
what influenza virus type is the mildest?
B and C
influenza A/B/C belongs to what virus family?
orthomyxo family of viruses
what enzyme do single stranded -RNA carry around for replication?
RNA Dependent RNA Polymerase (RDRP)
what is the mechanism used for replication in single stranded -RNA?
-RNA genome transcribed to mRNA and then a full +RNA using RDRP
how many segments does influenza A/B/C have?
8
what is characteristic about the influenza envelope?
it has spikes made of Haemagglutinin and Neuraminidase
what is the clue to determine what influenza strand is which (A/B/C)?
looking at the envelope for Neuraminidase protein
or
at the matrix for M1 or M2 protein
what determines the sub-types of influenza A/B/C?
Hemagglutinin
Neuraminidase
what is important about the M2 protein found in influenza?
1) they form proton channels in the membrane
2) promote uncoating and viral genome release
what inhibits the function of the M2 protein in influenza?
amantadine
remantandine
what does influenza use to bind to RBC’s?
haemagglutinin
the VAP of influenza will bind to epithelial cells using what receptor?
sialic acid receptors
what mechanism is used to protect the cell from the influenza VAP?
neutralization by using antibodies
what is the purpose of the neuraminidase enzyme in influenza?
it releases the mature virus from the cells