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To enter the cells, proteins on the surface of the virus interact with proteins of the cell. Attachment, or adsorption, occurs between the viral particle and the host cell membrane. A hole forms in the cell membrane, then the virus particle or its genetic contents are released into the host cell, where replication of the viral genome may commence.
Virus latency (or viral latency) is the ability of a pathogenic virus to lie dormant within a cell, denoted as the lysogenic part of the viral life cycle. [1] A latent viral infection is a type of persistent viral infection which is distinguished from a chronic viral infection. Latency is the phase in certain viruses' life cycles in which ...
Viral replication is the formation of biological viruses during the infection process in the target host cells. Viruses must first get into the cell before viral replication can occur. Through the generation of abundant copies of its genome and packaging these copies, the virus continues infecting new hosts. Replication between viruses is ...
The relationship between the latent period, the infectious period (the period of communicability) and the incubation period. In some diseases, as depicted in this diagram, the latent period is shorter than the incubation period. A person can transmit an infection without showing any signs of the disease.
Created Date: 8/30/2012 4:52:52 PM
Graph of herd immunity threshold vs basic reproduction number with selected diseases S will be (1 − q ), since q is the proportion of the population that is immune and q + S must equal one (since in this simplified model, everyone is either susceptible or immune).
These viruses have their lytic phase in mucoepithelial cells and are latent in neuronal cells. [6] Unlike HSV 1 and 2, there has not been any LAT found in the VZV latent cells. Instead, it appears that the main way that expression of viral transcripts is maintained at a lower level during latency is through chromatin structure. There are 5 ...
In the lytic cycle, the viral DNA exists as a separate free floating molecule within the bacterial cell, and replicates separately from the host bacterial DNA, whereas in the lysogenic cycle, the viral DNA is integrated into the host genome. This is the key difference between the lytic and lysogenic cycles.