SARS is a viral disease. It stands for Severe Acute Respiratory Syndrome and is caused by the SARS coronavirus (SARS-CoV). It leads to severe respiratory illness with symptoms such as fever, cough, and difficulty breathing.
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A virus contains nucleic acid and protein. The nucleic acid, either DNA or RNA, carries the virus’s genetic information. This is encased in a protein coat called a capsid, which protects the genetic material and helps the virus attach to ...
AIDS spreads by physical contact, specifically through direct exchange of bodily fluids such as blood, semen, vaginal fluids, and breast milk. It can also spread through shared needles or from mother to child during childbirth or breastfeeding.
AIDS virus, known as HIV, is a single-stranded RNA virus. It belongs to the retrovirus family and uses reverse transcriptase to convert its RNA into DNA, which integrates into the host’s genome. This integration allows the virus to replicate and ...
HIV is a disease caused by the human immunodeficiency virus (HIV), which leads to acquired immunodeficiency syndrome (AIDS). It is not caused by tuberculosis, fever disease, or cancer. The virus attacks the immune system, particularly CD4 cells, making the body ...
Enzymes are absent in viruses. Viruses lack cellular structure and do not carry out metabolic processes independently. They rely on host cells for replication and do not possess their own enzymes for metabolism.
Viruses are considered non-living because they can crystallize. Unlike living organisms, viruses are not cellular and can exist in a crystalline form outside of host cells, remaining inert until they infect a host to reproduce.
The virus grows in living cells. Viruses require a host cell to replicate and carry out their life cycle. Once inside the cell, they use the host’s machinery to reproduce and spread to new cells.
Edward Jenner discovered the smallpox vaccine. In 1796, he used material from cowpox sores to immunize a young boy against smallpox, demonstrating the efficacy of the first successful vaccine in history.
The vaccine for smallpox was developed by Edward Jenner. In 1796, Jenner used cowpox material to create immunity against smallpox, marking the first successful vaccine. This groundbreaking work laid the foundation for modern immunology.