Search results
3 days ago · 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.
- The Editors of Encyclopaedia Britannica
3 days ago · Deaths. >290,000–650,000 deaths per year [3] [4] Influenza, commonly known as " the flu " or just " flu ", is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue.
3 days ago · June 26, 2024. Federal health officials warned that the risk of contracting dengue in the United States has increased this year, a worrying sign as global cases of the mosquito-borne disease hit ...
People also ask
What is a viral infection?
What are the components of a virus?
Are pigs a mixing vessel of influenza viruses?
Which virus is responsible for swine flu?
2 days ago · Infectious disease is a process caused by an agent, often a microorganism, that impairs a person’s health. Infectious diseases typically are caused by bacteria, viruses, fungi, or parasites.
4 days ago · Pandemic, outbreak of infectious disease that occurs over a wide geographical area and that is of high prevalence, generally affecting a significant proportion of the world’s population over the course of several months. Learn about how pandemics arise and about pandemic preparedness and historical pandemics.
- Kara Rogers
- A pandemic is an outbreak of infectious disease that occurs over a wide geographical area and that is of high prevalence. A pandemic generally affe...
- Throughout history, there have been many deadly pandemics, but the Black Death and the influenza pandemic of 1918–19 rank among the most lethal. Th...
- Pandemics can be caused by several factors. For example, in some cases, a new strain or subtype of virus that first emerged in animals jumps to hum...
- Pandemics typically slow and come to an end on their own, though the process may be accelerated through effective preventive strategies, such as im...
4 days ago · Viral infection is the invasion of the body by a small agent known as a virus. Viruses replicate inside host cells and can produce toxins that cause disease.
4 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.
