Emerging Viruses

Viruses are obligate parasite that have no known value to man. Viruses have been around for a long time in many species and most of them emergent are zoonotic.

What causes viruses to emerge, as scientificaly study, most implortant factor of emerging viruses is human behaviour. Which virus are bound to spontaneous evolution of a new virus entity.

Emerging virus frm last 6 years:

Now= 1)Dengue virus (Flavivirus)
2)Influenza vitus(Orthomyxovirus)

Nov 2002-July 2003= SARS (Coronavirus)

Sep 1998-April 1991= Nipah virus (Paramyxovirus)

EG of emerging virus: Influenza virus

How avian influenza mutate........
H3N2 infect man, H5N1 infect birds, H5 is efficient at attachment so when Co-infection of both happen and in the host the virus replicate itself this process is call Random reassortment where the RNA strands transcribed and a new viral protein synthized thus with the mix, a ''new influenza virion formed, the H5N2.

So what are these H and N stand for...

H stand for Hemagglutinin
N stand for Neuraminidase

and there are 16 type of H and 9 type of N..some example of random assortment are H1N1 and H3N2