Viruses gain entry into host cells via several sites such as the skin, gastrointestinal tract, and respiratory tract. Once an infection has occurred, the virus may replicate in host cells at the site of infection or they may also spread to other locations. Animal viruses typically spread throughout the body mainly by way of the bloodstream, but can also be spread via the nervous system. Viruses have several methods to counter host immune system responses. Some viruses, like HIV, destroy immune system cells. Other viruses, such as influenza viruses, experience changes in their genes leading to antigenic drift or antigenic shift. In antigenic drift, viral genes mutate altering virus surface proteins. This results in the development of a new virus strain that may not be recognized by host antibodies. Antibodies connect to specific virus antigens to identify them as 'invaders' that must be destroyed. While antigenic drift happens gradually over time, antigenetic shift occurs rapidly. In antigenetic shift, a new virus subtype is produced through the combination of genes from different viral strains. Antigenetic shifts are associated with pandemics as host populations have no immunity to the new viral strain. Open Access journals make a quick review of articles and inform the authors within twenty one days of submission with the help of 3000 editorial team and quality review board which is ready to offer useful and informative results. Most of the peer-reviewed open access journals of OMICS Group is indexed in well-known indexing services like PubMed, Scopus, AGORA, ISI, ProQuest, Gale, Chemical Abstracts, and HINARI etc. Articles published in OMICS Group journals are permanently archived in the respective peer reviewed journals thus providing immediate and permanent access to individual papers and application of the scientific information. So, it is providing chance to get attract more number of students towards scientific research.
Last date updated on July, 2014