Exactness is an attribute of a replicator, which cannot have new (acquired) variability to pass on and does not have errors when copying (in general it is variation-free).
Invasive and migratory properties should notably be acquired, enabling cells to pass from a sessile to a motile phenotype and to ultimately metastasize.
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The concern is that avian flu could wipe out domestic bird stocks and that it could spread unchecked, should it acquire the ability to pass between humans.
But containing the spread of the disease could reduce the opportunities for the virus to acquire the ability to pass easily from person to person, a requisite for the virus to cause a global pandemic.
While no human deaths were reported in the U.S, similar strains in Asia have spread directly from birds to people; experts worry that such viruses could acquire the ability to pass from person to person.
The UN's Food and Agricultural Organisation (FAO) reckons H5N1 has cost South-East Asia's poultry farmers $10 billion since 2003.Yet more worrying is the danger that H5N1, which mutates rapidly, could acquire the ability to pass easily from person to person.
Experts project H5N1 could kill between 2 million and 7 million people if it acquires the ability to pass easily among humans.
The World Health Organization has warned that if the virus acquires the ability to pass easily between humans, it could start a global pandemic.
It has caused 154 human fatalities, and many scientists worry that if it acquires the ability to pass easily from human to human, it could touch off a devastating human pandemic and claim millions of lives.
The ability to acquire variability during lifetime (V > 0). 2. The ability to pass on acquired variability during multiplication (part, H > 0). 3. The ability to generate variability during multiplication (erroneous copying, μ > 0).
