3245>Viruses, like bacteria, carry infective agents into the human body. However, viruses are smaller in size and work differently to bacteria. Viruses work inside our bodies cells, while bacteria work extracellularly. The DNA of the virus changes the unique DNA signature of the cell it enters, and rather than killing that cell, the cell becomes a powerhouse for the production of the viral DNA. This is how the virus replicates, and effects our bodies systemically.
Antibiotics are ineffective against viral infections because the virus is protected by the cell membrane, and antibiotics work outside the cells.
Our own immune system works to destroy viral infections. One type of white blood cell (T lymphocytes) recognises the subtle changes that occur in the cell membrane when a virus has infected it, and then kills that "viral powerhouse", thereby hopefully eradicating the virus.
Because the human immune system is the main defence against viral infections, this type of infection poses more of a problem to populations in general, and it will probably be a virus that is responsible for any "pandemic" type of situation.
Viruses do not survive well outside of a host, as they are very fragile, while bacteria can survive for some time. Viruses therefore, are usually transmitted from host to host, by sneezing or coughing, for example.
Hope this answers your question!
Reply:u go to east hills i no it and this is from miss rainwaters test but answer is that they infect the immune system by causing the hosting immune cell 2 explode by injecting it's dna into other cells infecting other cells.
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