3. how does a virus spread course hero

The virus is mostly spread through respiratory droplet (saliva) of an infected person, mainly by unprotected sneezing or coughing. There are other secondary ways in which the disease can be spread that is, through touching contaminated surfaces with the virus, then a person touches their face that include the mouth, eyes and nose.

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Do viruses that replicate kill their hosts?

A virus that replicates like crazy and kills its host very quickly may not have an opportunity to spread to a new host. On the other hand, a virus that replicates slowly and causes little harm may have plenty of time to spread. If playback doesn't begin shortly, try restarting your device.

What is a virus and how dangerous are they?

Viruses are like predators with a specific prey they can recognise and attack. Viruses that do not recognise our cells will be harmless, and some others will infect us but will have no consequences for our health. Many animal and plant species have their own viruses.

What is the difference between a virus and a virus that replicates?

A virus that replicates like crazy and kills its host very quickly may not have an opportunity to spread to a new host. On the other hand, a virus that replicates slowly and causes little harm may have plenty of time to spread. What’s the difference between COVID-19 and the flu? How do viruses spread?

How do viruses get into the cell?

Endocytosis is a form of bulk transport that moves material into a cell by an infolding of the cell membrane around the material, forming a vesicle (small sac) that moves into the cell. The release stage also varies between viruses.

How does viral replication work?

Viral Replication. Viruses change the metabolism of their host in order to replicate, often killing the host in the process. This occurs through a life cycle involving multiple steps, each with specific processes that ensure viral survival. Viral replication occurs inside a host cell and typically greatly harms or kills that cell.

What are the steps of replication?

Replication occurs within the six distinctive steps of the virus life cycle. 1. Attachment is the first step in the virus life cycle, in which a virion attaches to a host cell's surface. 2. Penetration is the second step in the virus life cycle, when the virion enters or injects its nucleic acid into the host cell. 3.

Where does the virion envelope replicate?

The virion envelope is constructed from parts of the host plasma membrane in the process. The location of replication differs among viruses. Bacteriophages and most RNA viruses replicate in the host cell cytoplasm, whereas many DNA viruses replicate in the nucleus of eukaryotic host cells.

Does exocytosis kill the host cell?

Budding, typical in enveloped viruses, does not kill the host cell. Nor does exocytosis, common in nonenveloped viruses.