4^th World Congress on Virology and Diseases Control December 06-07, 2021 Vienna, Austria

Virology is the scientific discipline concerned with the study of the biology of viruses and viral diseases, including the distribution, biochemistry, physiology, molecular biology, ecology, evolution and clinical aspects of viruses. Viruses also cause serious diseases in plants and livestock. Viruses have been implicated in a disease that is ravaging our honeybees, threatening natural pollination cycles and thus much of agriculture.  A major branch of virology is virus classification. Viruses can be classified according to the host cell they infect animal viruses, plant viruses, fungal viruses, and bacteriophages. Viruses cause many important infectious diseases, among them the common cold, influenza, rabies, measles, many forms of diarrhea, hepatitis, Dengue fever, yellow fever, polio, smallpox and AIDS. Herpes simplex causes cold sores and genital herpes and is under investigation as a possible factor in Alzheimer's.

Viral evolution is a subfield of evolutionary biology and virology that is specifically concerned with the evolution of viruses. Many viruses, in particular RNA viruses, have short generation times and relatively high mutation rates (on the order of one point mutation or more per genome per round of replication for RNA viruses). Virus Genomes are very small and they are incredibly diverse and subject to rapid genetic change.

Viruses are smaller and simpler in construction than unicellular microorganisms, and they contain only one type of nucleic acid—either DNA or RNA—never both. As viruses have no ribosomes, mitochondria, or other organelles, they are completely dependent on their cellular hosts for energy production and protein synthesis. They replicate only within cells of the host that they infect. Animal virology developed largely from the need to control viral diseases in humans and their domesticated animals. Viruses, like other infectious agents, enter the animal body through one of its surfaces. They then spread either locally on one of the body surfaces or through lymphatic and blood vessels to produce systemic infection. 

Diagnosis of any probable viral infection with the help of various tests such as, specific, assorted or conventional tests to identify the causative virus. Multiple methods are in use for laboratory diagnosis in probing the viral infections, including serology, viral culture, antigen detection, and nucleic acid detection. Due to various developments in the technology, we see high-end and quite impressive immunologic and molecular diagnostic tests are developed to provide more accurate results and to detect the viruses- type, number and to identify their pathogenicity as well.

Viral immunology is simply the study of immune responses to viruses. A prolonged tissue-damaging effect resulting from an immune reaction against viruses is considered immunopathology. Such situations most commonly involve persistent viruses, which are themselves often mildly cytodestructive in the absence of an immune reaction.

Antiretroviral therapy refers to HIV treatment that uses a combination of two or more antiretroviral drugs. Antiretroviral therapy revolutionized HIV treatment upon its introduction in 1996. Antiretroviral therapy is an effective treatment for HIV. It does not cure the condition, but it can reduce the viral load to undetectable levels. This means that the virus is not transmittable through sexual activity and a person's immune system can recover. It usually takes around 3–6 months for the viral load to reach undetectable levels.

Infections caused by viruses are universal during childhood and adolescence. Clinicians will regularly care for children and adolescents who present with infections caused by a wide number of viral pathogens. These infections have varied presentations. Many infections may have clinical presentations that are specific to the infecting virus but present differently, based on the age and immunocompetence of the patient.

Viruses are intracellular pathogens that have evolved many devious strategies to evade host immune responses and, as a consequence, have plagued human health throughout history. Combating viral diseases with vaccines or antiviral drugs, or both, is a constant challenge. Even when successful strategies are discovered and employed, the high rate of genetic change exhibited by many viruses, particularly RNA viruses, often enables drug resistance or vaccine escape.

Vaccines have been among the most effective health approach for protecting the individual against viral disease, with two of worlds successful vaccine being against small pox and poliovirus. Viral vaccines  is a combination of inactivated viruses and activated viruses. Inactivated or killed viral vaccines contain viruses, they do not have ability to replicate and to bring about a response it contains an antigen. Activated or livevaccines contain the live form of the virus. Currently, Virus like particles organizes a new vaccine concept.

The epidemiology of plant virus diseases concerns the cyclical development of virus diseases within plant populations in time and space. Tobacco mosaic virus (TMV) is a positive-sense single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae. In the viral life cycle, viral entry is the emergent stage of infection, as the virus invades with the host cell and intrudes viral material into the cell.

Viral oncology is a subdivision of oncology,in these it is concerned with treatment of  human cancers /tumors with virus particles. Approximately 20% of all cancers worldwide results from chronic infections, in specific, up to 15% of human cancers is characterized by a viral aetiology with higher incidence in Developing Countries. Certainly, the infectious nature of specific tumors has important implications in their prevention, diagnosis, and therapy. In the 21st Century, the research on viral oncology field continues to be dynamic, with new significant and original studies on viral oncogenesis and as a translational research from virology for the treatment of cancer.

The human immunodeficiency virus is a lentivirus that causes HIV infection and AIDS.HIV diagnosis is done by testing your blood or saliva for antibodies to the virus. HIV/AIDS clinical trials are research studies done to have a better approach, distinguish, or treat HIV/AIDS. Clinical trials are the predominant way to determine if new medical approaches to HIV/AIDS are safe and effective in people.

Viral gastroenteritis is an intestinal infection marked by watery diarrhea, abdominal cramps, nausea or vomiting, and sometimes fever. The most common way to develop viral gastroenteritis — often called stomach flu —is through contact with an infected person or by ingesting contaminated food or water. If you're otherwise healthy, you'll likely recover without complications. But for infants, older adults and people with compromised immune systems, viral gastroenteritis can be deadly.

Currently, molecular studies on replication, assembly, and host interactions of insect viruses have contributed enormously to molecular, cellular, organismal biology. The ease with which many insect viruses are propagated in cell cultures or live animals, the high yields virus particles or virus encoded macromolecules and the simplicity with which many insect viruses can be genetically manipulated represent just a few experimental advantages provided by these pathogens.

The study of parasites that multiply inside bacteria by making use of the host biosynthetic machinery is known as bacterial virology. Bacteriophages are the viruses that infect and replicate in bacteria. Since the early 1970s, bacteria have continued to develop resistance to antibiotics such as penicillin, and this has led to a renewed interest in the use of bacteriophages to treat serious infections.