- How are viruses different from other infectious agents?
- Why viruses Cannot grow on artificial media?
- How do you isolate a virus in your blood?
- Can viruses reproduce on their own?
- How are viruses cultured in the laboratory?
- Can viruses be crystallized?
- How are viruses detected?
- What is it called when a virus reproduces?
- What are the three methods used to cultivate viruses?
- Can viruses be cultivated?
- What is the most common method of viral identification?
- Why are viruses cultivated?
- How are animal viruses cultured?
- Why are viruses hard to cultivate in the laboratory?
- Who first crystallized virus?
- Are viruses living?
- Does virus grow on agar?
- Why do antibiotics work against bacteria but not viruses?
How are viruses different from other infectious agents?
All viruses have is a protein coat and a core of genetic material, either RNA or DNA.
Unlike bacteria, viruses can’t survive without a host.
They can only reproduce by attaching themselves to cells.
In most cases, they reprogram the cells to make new viruses until the cells burst and die..
Why viruses Cannot grow on artificial media?
Viruses can infect animals, plants, and even other microorganisms. Since viruses lack metabolic machinery of their own and are totally dependent on their host cell for replication, they cannot be grown in synthetic culture media.
How do you isolate a virus in your blood?
Virus isolation can be attempted by inoculation of nasopharyngeal and ocular swabs, semen, intestinal tissues, spleen, or most other tissues, or the buffy coat or serum of blood to cell cultures.
Can viruses reproduce on their own?
How do viruses multiply? Due to their simple structure, viruses cannot move or even reproduce without the help of an unwitting host cell.
How are viruses cultured in the laboratory?
Cultivation of Viruses. Viruses can be grown in vivo (within a whole living organism, plant, or animal) or in vitro (outside a living organism in cells in an artificial environment, such as a test tube, cell culture flask, or agar plate).
Can viruses be crystallized?
In 1935 tobacco mosaic virus became the first virus to be crystallized; in 1955 the poliomyelitis virus was crystallized. (A virus “crystal” consists of several thousand viruses and, because of its purity, is well suited for chemical studies.) Virology is a discipline of immediate interest because many human diseases,…
How are viruses detected?
Viral antigens develop on the surface of cells infected with a specific virus. A viral antigen detection test is done on a sample of tissue that might be infected. Specially tagged (with dye or a tracer) antibodies that attach to those viral antigens are mixed with the sample.
What is it called when a virus reproduces?
Most viruses reproduce through a process called lytic infection. During lytic infection, a virus enters the host cell, makes a copy of itself, and causes the cell to burst, or lyse.
What are the three methods used to cultivate viruses?
Cultivation of viruses can be discussed under following headings: Animal Inoculation. Inoculation into embryonated egg….Types of cell culturePrimary cell culture: … Diploid cell culture (Semi-continuous cell lines): … Heteroploid cultures (Continuous cell lines):
Can viruses be cultivated?
Viruses can be cultivated within suitable hosts, such as a living cell. To study bacteriophages, for example, bacteria are grown in a suitable growth medium; then bacteriophages are added. … Animal and plant viruses are cultivated in cell cultures.
What is the most common method of viral identification?
PCR is one of the most widely used laboratory methods for detection of viral nucleic acids. PCR analysis can also be used to determine viral RNA, by adding an initial step in which the RNA is converted into DNA; know as reverse transcriptase PCR (RT-PCR).
Why are viruses cultivated?
The primary purposes of virus cultivation is: To isolate and identify viruses in clinical samples. Demonstration of virus in appropriate clinical specimens by culture establishes diagnosis of viral diseases. To do research on viral structure, replication, genetics and effects on host cell.
How are animal viruses cultured?
Tissue culture of animal viruses involves growing animal cells in flasks using various broth media and then infecting these cells with virus.
Why are viruses hard to cultivate in the laboratory?
Unlike most bacteria that can be grown in artificial media (eg agar plates, nutrient broth) viruses cannot be grown on artificial media but must be grown in living cells. There are only three ways in which viruses can be grown in the laboratory. – surplus cells can be stored indefinitely in liquid nitrogen (-196°C).
Who first crystallized virus?
Wendell StanleyIn 1935 Wendell Stanley crystallized tobacco mosaic virus (TMV); an accomplishment for which he was awarded a share of the 1946 Nobel Prize in Chemistry. As a matter of history, Stanley’s Nobel award was the first ever bestowed on a virologist. Wendel Stanley. 1946 Nobel Prize photo.
Are viruses living?
Viruses are not living things. Viruses are complicated assemblies of molecules, including proteins, nucleic acids, lipids, and carbohydrates, but on their own they can do nothing until they enter a living cell. Without cells, viruses would not be able to multiply. Therefore, viruses are not living things.
Does virus grow on agar?
Viruses cannot be grown in standard microbiological broths or on agar plates, instead they have be to cultured inside suitable host cells.
Why do antibiotics work against bacteria but not viruses?
Antibiotics cannot destroy viruses because they specifically target the machinery found in bacteria. Since viruses do not contain any of this machinery, the antibiotic does not have a target to attack. Anti-viral medications and vaccines are can disrupt the reproductive cycle of the virus.