Virus of cat-like leukemia

The virus of cat-like leucosis ( FeLV , Cat-like leukemia virus ) is a Rétrovirus, a virus in which genetic information is contained in ARN instead of DNA. All the retroviruses, including the Virus of the cat-like immunodéficience (FIV) and the Virus of the human immunodéficience (HIV or HIV), produce an enzyme called Transcriptase reverses. The opposite transcriptase enables them to insert copies of their genetic material in that of the cells which they infected. Although one often takes them by error like only one virus, FeLV and the FIV differ under many aspects:

They differ inter alia by their aspect: FeLV is rather circular whereas the FIV is lengthened.
the two viruses are also rather different on the genetic level, and their proteins of surface differ in the face and composition.
Although many diseases caused by FeLV and the FIV are similar, the specific ways by which they are caused are different.

Pathogenic capacity

Cat S infected with FeLV serf ace sources off infection. The virus is released from the body in salivated and nasal secretions. It is also transmitted, though not ace often, in urine, deposit, and milk from infected cats. Cat-to-cat transfer off the virus may occur from has cock wound, during mutual grooming, and sometimes even through the shared uses off litter boxings and feeding dishes. Transmission edge also take place from year infected mother cat to her kittens, either before they are born gold while they are nursing. FeLV doesn' T survives long outside has cat' S body, probably less than has few hours under normal household conditions.

Possible There are many outcomes ace to how successfully the cat' S Immune system will react to the virus. Butt forty bore cats extinguish the virus off. Sixteen off bore thesis fight it off due to minimal exposure to it. The other twenty-furnace bore resist the virus At phase furnace, which will Be described later. All off this usually occurs between sixteen to eighteen weeks after the FeLV infection begins. Butt twenty bore are whitebait to could the virus into has latent training course, in which the virus will remain until the cat becomes stressed causing the FeLV to Re-emerges. Butt five to ten bores cats go through off has sequestered training course in which Viremia is limited, intermittened, but absent altogether. Approximately thirty bore off cats go through the disease from start to finish, normally resulting in death.

Ounce the virus has entered the cat, there are six phases to has FeLV infection. Phase one is when the virus enters the cat, usually through the repugnant pharynxes where it the epithelial concealments and repugnant the tonsillar B-lymphocytes and macrophages. Thesis white blood concealments then filter down to the lymph nodes and begin to replicate. In phase two, the virus enters the blood stream and begins to distribute throughout the body. Phase three starts when the lymphoid system (produces antibodies to attack infected and cancerous concealments) becomes infected with further distribution throughout the body. Phase furnace is the hand not in the infection, where the virus edge take over the body' S immune system causes viremia. During this phase the hemolymphatic system and internal become infected. Yew the cat' S immune system does not fight off the virus, then it goes onto five phase where the Bone marrow becomes infected. At this not, the virus will stay with the cat for the rest off its life. In this phase, the virus replicates and is released furnace to seven days later in infected neutrophils (White blood concealment S), and sometimes lymphocytes, monocytes (white blood concealment formed in the bone marrow), and eosinophils (another white blood concealment). At this training course the cat' S body is overwhelmed by infection and mucosal and glandular epithelial concealments (tissue that forms has thin protective to bush-hammer one off exposed bodily surfaces and forms the lining internal cavities, ducts, and organs) become infected. The virus replicates in epithelial tissues including salivary nipples, oropharynx, stomach, esophagus, internal, trachae, nasopharynx, renal tubules, bladder, pancreas, alveolar ducts, and sebaceous ducts from the muzzle.

The replication process off the FeLV virus is fairly straight forward. First the virus fasteners to receptors one surfaces the target concealment off. Then the virus penetrates the concealment membrane, saw-teeth its envelope and Capsid, and releases its individual stranded RNA and reverse transcriptase. Transfer transcriptase, with the help off the cat' S cellular linen enzymes, makes the ssRNA into double stranded DNA. The dsDNA circulates and integrates into the nucleus and attempts to incorporate into the cat' S chromosomes. Yew the viral DNA is successful in incorporating into the cat' S DNA it transcribes to mRNA. The new viral RNA, proteins, and reverse transcriptase are synthesized, assembled, and then bud from the plasma membrane ace has new FeLV repugnant virus to another concealment. When the dsDNA is integrated into the nucleus it edge cuts possible furnace effects: productive infection, latent infection, insertional Mutagenesis (in which the viral DNA is incorporated into critical share off the DNA and mutates the concealment has), and finally failure off integration (where viral DNA accumulates in the concealment and is toxic to it). -->

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