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2 days ago · It can be an emergent virus, one that represents a new virus, but it can also be an extant virus that has not been previously identified. The SARS-CoV-2 coronavirus that caused the COVID-19 pandemic is an example of a novel virus.
Jul 17, 2024 · The severe form of dengue fever, also called dengue hemorrhagic fever, can cause serious bleeding, a sudden drop in blood pressure (shock) and death. Millions of cases of dengue infection occur worldwide each year. Dengue fever is most common in Southeast Asia, the western Pacific islands, Latin America and Africa.
2 days ago · Viruses recognise and bind to target cells by the interaction of molecules on their surface, with those on the target cell. These are called “surface receptors” – and work a little like a lock and key: a virus can only invade a cell is its surface molecule (the key), matches the receptor (the lock) on the host cell.
2 days ago · COVID-19, highly contagious respiratory illness, the cause of the COVID-19 pandemic. COVID-19 is caused by the coronavirus known as SARS-CoV-2. There is no cure for COVID-19, but individuals can be protected against severe illness through vaccination. Learn about the symptoms, treatment, and prevention of COVID-19.
3 days ago · Shipments of the Russian-made Sputnik V COVID-19 vaccine, an adenoviral vector, are seen in Guatemala in 2021. For use as vaccine platforms, viral vectors can be engineered to carry a specific antigen associated with an infectious disease or a tumor antigen.
Jul 19, 2024 · Retrovirus, any of a group of viruses that belong to the family Retroviridae and that characteristically carry their genetic blueprint in the form of ribonucleic acid (RNA). Retroviruses cause tumor growth and certain cancers in animals and are associated with slow infections of animals.
2 days ago · The classic symptoms of a bacterial infection are localized redness, heat, swelling and pain. One of the hallmarks of a bacterial infection is local pain, pain that is in a specific part of the body. For example, if a cut occurs and is infected with bacteria, pain occurs at the site of the infection.
