Viruses (biological)

ABC.

A is the worst, causes pandemics and epidemics

B causes epidemics

C is minimally problematic

If you're talking about strains, you have 9 types of Hemagglutinin and 16 types of Neuraminidase. So H5N1 (swine flue from a couple years ago) has Hemagluttinin number 5 and Neuraminidase number 1

A virus is technically classified as a non living entity. It can only survive and proliferate upon contact with its host. A virus is an obligate parasite - meaning it cannot survive in the absence of its host. I virus is composed of a smaller genome than a bacteria and has specific and limited functions. Bacteria on the other hand have organelles and other sub cellular structures in their cytoplasm. Certain bacteria are infections to humans. The mode of attack is very different for bacteria and viruses. While bacteria generally release toxins into the body, viruses invade cells, replicate within them and destroy the host genome resulting in cell death

Very few viruses have what you call a "head".

Viruses are composed of two main parts: an outer protein covering called a capsid and an inside core of either DNA or RNA. Not both DNA and RNA. Some of these have an envelope over the capsid. The ones that do not are said to be naked. The proteins in the capsid allow the virus to attach to the "docking stations" proteins of the host cell. The naked viruses are more resistant to changes in the environment.

Some naked viruses include poliomyelitis, warts, the common cold, chickenpox, shingles, mononucleosis, herpes simplex (cold sores), influenza, herpes viruses and HIV (AIDS).

Some enveloped viruses include norovirus (stomach bug), rotavirus and human papillomavirus (HPV).

The envelope can be damaged by freezing temperatures, chlorine, and phenol. If damaged the virus cannot infect.

It uses the energy of a host cell, in a sort of parasitic way.

A virus is non-living, although it is a well structured organism able to reproduce and cause things to happen. To do these things, it does not generate or use its own power or energy. Instead, it invades a living host (a plant, animal or human) and attaches a virus particle into a cell and makes that living cell of the host to which it has attached change its operations from working for the host to working for the virus.

The cell begins to create duplicates of the virus particles. It does this because once the virus has attached itself, it adds part of its own DNA or RNA instructions into the cell which turns the cell into a virus-making factory. The cell's original DNA is no longer giving the instructions to the cell and so it is no longer doing what it is supposed to for the host and eventually dies when it bursts open to release the virus "babies".

This is what makes us get sick if enough of our cells are pulled off their usual jobs by the virus and made to do other things and then die. All the energy that is needed to reproduce the virus is supplied by the host cell, and as it produces new virus particles those "offspring" attach to more cells and the process repeats cell by cell particle by particle as it moves through our bodies and attaches to more cells. Eventually (hopefully) our body's immune system learns the key to turning the virus off (or "killing" it). If too many of our cells are diverted before the immune system figures out how to attack the virus to stop it, then we can have organ and system failures and that is how we get very ill or even die.

For many years, rickettsiae and chlamydiae were thought to be viruses because they are very small and are intracellular parasites. They are now known to be bacteria because they possess both DNA and RNA, have cell walls similar to those found in gram-negative bacteria, divide by binary fission, and are susceptible to antibiotics that produce an effect in most bacteria. therefor it is A BACTERIA AND NOT A VIRUS.

by God Omenmayor....the sustainer

Viruses do not eat in the traditional sense like other organisms do. They rely on a host cell to reproduce and replicate their genetic material. Once inside a host cell, they hijack the cell's machinery to make new copies of themselves.

The motaba virus, which is an "Ebola-like" fictional hemorrhagic virus from the film Outbreak, was initially transmitted through some kind of fluid exchange, and later became airborne.

Virus don't need food at all. They are just some DNA o RNA coveres with a protein capsule. They have some receptors that match with living organisms Membrane proteins, lipids or carbohydrates. When they find this receptors the DNA or RNA inside the capsule is transfered to the Cytoplasm, once there some specific enzymes will transport the DNA to the Nucleus in order for it to be transcribed and then to the Rybosomes to sintetize more of this proteins. The RNA virus just gets its RNA to a Rybosome and profuce this proteins. Virus cannot reproduce without infecting a living organism's cell.

Generation time has been used synonymously with the term "serial interval." Serial interval is the time from the onset of symptoms in the index case until the onset of symptoms in any secondary cases. For human seasonal influenza, the mean serial interval has been estimated as 3.6 days (95% confidence interval = 2.9-4.3 days) (Cowling BJ et al, Estimation of the Serial Interval of Influenza, Epidemiology 2009; 20(3): 344-7.

viruses aren't alive. they're protein covered DNA molecules which have no nucleus. they do not reproduce, nor do they eat. viruses don't move, either. they sit around waiting to be found. once they are found, they wait until approached by a white blood cell. then, they inject themselves into the white blood cell. when a white blood cell reproduces via mitosis, it reproduces with the virus DNA code. --------------------------------------- Numerous corrections: -True: viruses aren't alive. They are not even cellular. -True: they are protein covered and have no nucleus. However they can also contain RNA genomes. -True: they do not do anything by themselves. However different types of viruses infect many different types of cells, from bacteria to human nerve cells. A virus that specifically infects human white blood cells (specifically CD4+ TH2 cells) is the HIV virus. -False: an infected cell does not need to divide for the virus to reproduce. A virus starts to reproduce directly after it enters a cells. It imemdiately hijacks the cell's machinery and starts to churn out virus particles. The virus particles then exit the infected cell either by bursting it or by wrapping themselves in the cell membranes of the infected cell to make them less detectable. (There are specific cases where the virus genome enters lysogeny, i.e. integrates itself into the genome of the host and becomes silent, and thus are copied into the daughter cells of the host. These integrated genomes eventually become excised and activated and starts the normal life cycle of a virus). The free virus particles then go on to infect more cells.

Bacteriophages only infect bacteria, they do not cause disease in humans. The CDC and the WHO classify bacteriophages under biosafety level 1 because they rarely cause human infections. There are only a few exceptions where bacteriophages have causes disease in humans, and that was in a few select people with unique and rare genetic disorders.

The only real link between bacteriophages and actual human pathogens, is there ability to alter the genome of non-virulent bacteria strains; thus, producing more virulent strains. One example is Cholera. Most strains of Cholera are harmless, but it has been hypothesized that bacteriophages are partially responsible for 'producing' harmful CHolera strains due to the nature of viral host cell invasion.

The mimivirus has a length of 900 nanometers.

Viruses and cells both contain genetic material and can replicate, but viruses lack cellular structures like organelles and cannot carry out metabolic processes on their own. They require a host cell to reproduce and are considered obligate intracellular parasites.

Viruses can cause a wide range of illnesses, including the common cold, flu, HIV/AIDS, hepatitis, Ebola, Zika, and COVID-19. Viral infections can affect various systems in the body, including the respiratory, digestive, and nervous systems.

The shape of viruses varies greatly. They can be shaped like small balls (spherical viruses) like strands of spaghetti (flexous viruses) rigid rods, like bullets (baciliform viruses) and like geometric shapes (isocohedral viruses) The smallest viruses can be as small as 20nm (20/1,000,000 of a mm) to as much as 2,000 nm for some flexous plant viruses.

A bacteriophage. Bacteriophages are viruses that infect and replicate within bacteria by injecting their genetic material into the bacterial cell, ultimately causing the cell to burst and release more phages to infect other bacteria.

The truth is, no one really knows. Flu strains are mutating all of the time. Each time a flu strain mutates to act in a different way, it is given another name (if we actually discover it and can recognize that it is different). The other problem is discovery. Often, different strains act in the same way. Therefore, it isn't really important to distinguish between strains. Only strains that seem to 1) be popular in the next flu season or 2) pose a great threat to humans are actually identified.

There are more than 200 viruses that cause the "common cold". 40% of common colds are caused by the rhinovirus. It is a member of the picornavirus family and is small, icosahedral (a 20-faced polyhedron), non-enveloped virus containing one positive RNA strand. Another type of virus that commonly causes a cold is the coronavirus, which causes approximately 20% of common colds. Coronaviruses are pleomorphic (take different forms over the life cycle), but spherical in shape with large, widely spaced club-shaped peplomers.

Rubella is not a virus, it is a contagious viral infection caused by the rubella virus.

Viruses do contain genetic material and a protein coat, but they lack the cellular structure found in living organisms. They are considered to be organized structures, but they are not considered to be living organisms due to their dependency on host cells for replication.

A mutant virus is a virus that has undergone genetic changes, or mutations, in its structure. These mutations can alter the virus's ability to infect cells, replicate, or evade the immune system. Mutant viruses can potentially have different characteristics or behaviors compared to the original, wild-type virus.

Viruses are small infectious agents that can only replicate inside the cells of living organisms. They consist of genetic material (DNA or RNA) surrounded by a protein coat. Viruses can infect all types of life forms, from animals and plants to bacteria. They are responsible for a wide range of diseases in humans, animals, and plants.

It seems like you are referring to the concept of computer viruses being activated or active on a system. It's important to have up-to-date antivirus software to protect your devices from these threats. Be cautious of clicking on suspicious links or downloading unknown files to prevent virus infections.

The Lysogenic Cycle. The virus' DNA will integrate itself into the host cell's own DNA, such that the cell will continue to make copies of the virus for as long as it survives (and if it passes down its DNA to daughter cells).