Latent Cranial nerve viral DNA Virus moves up cranial nerve. Brainstem The initial infection in children causes cold sores and sometimes sore throat. The virus then moves along a sensory cranial nerve to nerve ganglia near the brain, where it becomes latent. (a) Virus becomes latent after initial infection Reactivation of virus in neuron Virions move down cranial nerve. The latent virus is reactivated, moves back along the sensory nerve to the face and causes cold sores again. (b) Activation of latent virus FIGURE 13.17 Infection Cycle of Herpes Simplex Virus, HSV-1

Q: What are the differences between bacteria and viruses?

A: The differences between bacteria and viruses are as follows:Bacteria are cellular organisms whereas…

Q: Which type of phages can perform   generalized transduction?

A: Zinder and Lederberg in 1952 discovered Transduction in S.typhimurum. The phage which mediated DNA…

Q: Are viruses cellular beings?

A: Cellular organisms consist of cellular structures for example plants and animal whereas non-cellular…

Q: what does the lytic cycle let the virus do?

A: Bacteriophage(phage) is defined as a group of viruses where they play a major role infecting the…

Q: Can antibiotic kill virus?

A: Antibiotics can't kill  virus. Antibiotics are medicines which kill bacterial infection.

Q: How do you kill a virus artificially?

A: Virus is a submicroscopic infectious agent that needs a living host for their replication. It causes…

Q: How does a virus reproduce?

A: Viruses are microscopic obligate parasites that lack a cell or cell membrane.

Q: are viruses alive ?

A: Some of the key features of a living thing areThey must maintain homeostasisThey must reproduceThey…

Q: How are viroids different from viruses?

A: The viruses and viroid are the small particles that are parasitic infectious agents. These can…

Q: A virus does not contain ribosomes. How does it manage to ensure the synthesis of its proteins?

A: Viruses are infectious agents that infect the living cell of the organism. They infect the cells,…

Q: Do retroviruses change your DNA?

A: Gene is the basic functional unit of heredity. A gene is a sequence of nucleotides in genome that…

Q: Can viruses reproduce by themselves?

A: A virus is an infectious microorganism made up of a nucleic acid segment (DNA or RNA) encased in a…

Q: What is the shape and size of viruses?

A: Viruses are microscopic agents that can replicate only inside host cells. They can infect all types…

Q: What types of genomes do viruses have?

A: Step 1 Introduction Viruses are non-cellular, simple, obligate intracellular parasite consisting of…

Q: What is the difference between a virus and bacteria

A: Bacteria are unicellular prokaryotic organisms. It lacks a structure called nucleus and contains…

Q: What is meant by a viral titer?

A: Microbe or microorganism is a microscopic organism. It exists as multicellular, unicellular, or cell…

Q: What is gamma phage?

A: Bacteriophages are the obligate intracellular parasites that can proliferate inside the bacterial…

Q: what is Host DNA?

A: The DNA is the genetic material that is passed from one generation to the next generation. It is…

Viral Replication

The virus is acellular and considered non-living outside the host cell. The replication of the virus occurs only inside the living cells. Only a few genes are present in the smallest virus, whereas many genes are present in the largest virus. These genes encode specific viral proteins.