Download Deadly Diseases and Epidemics - West Nile Virus (2nd by Jeffrey N. Sfakianos PDF

By Jeffrey N. Sfakianos

West Nile Virus, moment variation, lethal ailments and Epidemics.

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Extra info for Deadly Diseases and Epidemics - West Nile Virus (2nd Edition)

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3╇ The chance that a mosquito will acquire West Nile virus while feeding depends on the concentration of the virus, or viremia, in the blood vessels of the host. As the mosquito feeds, it is more likely to acquire a virus particle from a host that has infectious viremia (more virus particles in the blood) than a host with noninfectious viremia. This process is illustrated here. 51 52 west nile virus vulÂ�nerable to West Nile virus than other American birds. The crow’s susceptibility could be a result of several factors.

Although precautions to avoid mosquito bites, such as insect repellent sprays, are often effective, they can be extremely inconvenient to use every time you leave the protection of your home. West Nile Virus Transmission Cycle Part of the ability of the West Nile virus to rapidly become an epidemic, an outbreak of a contagious disease that spreads quickly and widely, is due to its transmission cycle, or how the pathogen is passed from host to host. 1╇ The natural transmission cycle of the West Nile virus occurs between birds and mosquitoes.

The acidic nature of the compartments that take in the virus triggers a change in the hemagglutinin molecule that causes a portion of the protein, known as the fusion peptide, to insert into the target cell’s membrane. The conformational change that the proteins undergo when exposed to acidic environments was an extraordinary discovery. Two scientists were responsible for making this discovery: Don Wiley of Harvard University and Sir John Skehel of the National Institute for Medical Research in London, England.

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