Dating the emergence of pandemic influenza viruses dating game handsome boy lyrics
The second analysis shows that NIV had attempted a little evolutionary change among humans and before introduction into human it had long evolutionary history.
Statistical analysis shows that viruses from both outbreak and nearest group have homologous genes in their genomes which might be reflecting the phylogenetic relationship of strains, and also the presence of unique mutations between groups A-B may associate with increased virulence of NIVs.
Nearly everyone has experienced the fever, aches, and other symptoms of seasonal flu that afflicts 5 – 20 percent of Americans each year.
Although these yearly flu epidemics can be fatal in some people, such as the elderly, young children, and people with certain underlying heath conditions, flu is generally not a life-threatening disease in healthy individuals.
This virus exhibited higher pathogenicity in mice and ferrets than an authentic avian influenza virus.
Pandemics are associated with widespread illness - and sometimes death - even in otherwise healthy people.
The phylogenetic trees of eight genomic segments illustrate that, so far, the sequences of the NIVs (outbreak group A) are relatively homogeneous and derived by the event of multiple genetic reassortment of Eurasian and North American swine, avian and human viruses (group B).
It implies that some of the influenza viruses in group B had higher potential to evolve and getting the ability to transmit from human-to-human after animal-to-human cross-species transmission.
Flu, or influenza, is a contagious respiratory illness that spreads from person to person through the air via coughs or sneezes or through contact with infected surfaces.
It is caused by a group of continuously changing viruses called influenza viruses.