About viruses and viral disease
20 April 2010
Download: .wmv (322 MB) | .mp4 (91 MB)
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West Nile virus
can you make it just a bit louder ? I have to use max.volume.There should be simple software to increase volume – I don't know.
I'm wondering : why do viruses cause symptoms ?Apparantly this is not necessary to replicate and spread.And it's a disadvantage because it provokes host behaviour response.Is it just a weakness to be removed by further evolution ?
Can there be many asymptomatic viruses out there not yet detected ?
Influenza A as a bird-disease causes severe pandemics in humans or poultry.Influenza B a a human disease is more constant and usually less virulent.Influenza C is even older for humans and only like a cold.
strategy : make viruses less virulent, release them and let them outcrowd the original strains
47:20 : VRR could infect all students with measles in one lesson by just talking !
if measles learns to evade immunity like flu that could be a very dangerous/successful virus
I'll work on the audio. Why do viruses cause symptoms? Most of thetime it's the immune response. Early virus detection by the innateresponse leads to production of pro-inflammatory cytokines, whichcause rubor, dolor, calor, tumor. For those viruses that arecytopathic (eg influenza) there is the tissue damage caused by thevirus; but many early symptoms are the hosts' fault. And yes, thereare plenty of asymptomatic infections out there – many of us areinfected with any number of viruses and don't know it. As are manyanimals in the wild.
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