The seven classes of viruses in the Baltimore Classification System are as follows:

Viruses have primarily been engineered for use by humans as so-called recombinant (or subunit) vaccines. In this technology, the genetic material of a harmful virus is analyzed to identify the gene or genes that encode the antigens (identifying proteins) that trigger the body’s immune response.

All viruses contain nucleic acid, either DNA or RNA (but not both), and a protein coat, which encases the nucleic acid. Some viruses are also enclosed by an envelope of fat and protein molecules. In its infective form, outside the cell, a virus particle is called a virion.

Viral Morphology Viruses are acellular, meaning they are biological entities that do not have a cellular structure. Therefore, they lack most of the components of cells, such as organelles, ribosomes, and the plasma membrane.

DNA viruses. DNA viruses have genomes made of deoxyribonucleic acid (DNA) and are organized into two groups: double-stranded DNA (dsDNA) viruses, and single-stranded DNA (ssDNA) viruses. They are assigned to four separate realms: Adnaviria, Duplodnaviria, Monodnaviria, and Varidnaviria.

• Class I: Double stranded DNA (dsDNA) viruses.
• Class II: Single stranded DNA (ssDNA) viruses.
• Class III: Double stranded RNA (dsRNA) viruses.
• Class IV: Single stranded RNA (ssRNA) viruses.
• Class V: Single stranded RNA (ssRNA) viruses.

Morphology: Viruses are grouped on the basis of size and shape, chemical composition and structure of the genome, and mode of replication. Helical morphology is seen in nucleocapsids of many filamentous and pleomorphic viruses.

Viruses are neither prokaryotic or eukaryotic. Viruses are not made of cells. Viruses cannot replicate on their own. Most scientists do not consider viruses to be living.

Viruses can be classified on the basis of capsid shape, presence or absence of an envelope, and type of nucleic acid.

Viruses are classified into four groups based on shape: filamentous, isometric (or icosahedral), enveloped, and head and tail. Many viruses attach to their host cells to facilitate penetration of the cell membrane, allowing their replication inside the cell.

Viruses are not made out of cells, they can’t keep themselves in a stable state, they don’t grow, and they can’t make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.

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.

cancer. dementia, including Alzheimer’s disease. advanced lung, heart, kidney and liver disease. stroke and other neurological diseases, including motor neurone disease and multiple sclerosis….Conditions that cannot be cured

• symptom control.
• independence.
• emotional, spiritual and cultural wellbeing.
• planning for the future.

One of the worst plagues in history arrived at Europe’s shores in 1347. Five years later, some 25 to 50 million people were dead. Nearly 700 years after the Black Death swept through Europe, it still haunts the world as the worst-case scenario for an epidemic.

Rabies is nearly 100 percent fatal if not treated. There are approximately 55,000 deaths each year, primarily in Asia and Africa. Doses of the rabies vaccine after a bite from an infected animal will essentially abort the disease. But a person must receive treatment immediately.

The cancers with the lowest five-year survival estimates are mesothelioma (7.2%), pancreatic cancer (7.3%) and brain cancer (12.8%). The highest five-year survival estimates are seen in patients with testicular cancer (97%), melanoma of skin (92.3%) and prostate cancer (88%).

Summary. Cardiovascular diseases are the leading cause of death globally. The second biggest cause are cancers.