- What is the deadliest disease in human history?
- What are the stages of flu?
- What is Influenza A vs B?
- What is the significance of the letters and numbers in flu strains identified by the letters H and N?
- Is Flu A or B worse?
- Why is h1n1 called h1n1?
- Why was the 1918 flu so deadly?
- Where did swine flu start?
- What is the h1 n1 virus?
- What is the deadliest strain of flu?
- What does h7n9 mean?
- How is h7n9 transmitted?
- Is influenza positive sense?
- What does h5n1 stand for?
- What is the deadliest illness?
- Which cell organelle does the virus inject its DNA into?
- What is H and N in virus?
- WHO h5n1 human cases?
- What is the difference between h5n1 and h7n9?
- How long is person with flu contagious?
- What are the symptoms of influenza A or B?
What is the deadliest disease in human history?
Cholera, bubonic plague, smallpox, and influenza are some of the most brutal killers in human history.
And outbreaks of these diseases across international borders, are properly defined as pandemic, especially smallpox, which throughout history, has killed between 300-500 million people in its 12,000 year existence..
What are the stages of flu?
What to expect with the fluDays 1–3: Sudden appearance of fever, headache, muscle pain and weakness, dry cough, sore throat and sometimes a stuffy nose.Day 4: Fever and muscle aches decrease. Hoarse, dry or sore throat, cough and possible mild chest discomfort become more noticeable. … Day 8: Symptoms decrease.
What is Influenza A vs B?
Unlike type A flu viruses, type B flu is found only in humans. Type B flu may cause a less severe reaction than type A flu virus, but occasionally, type B flu can still be extremely harmful. Influenza type B viruses are not classified by subtype and do not cause pandemics.
What is the significance of the letters and numbers in flu strains identified by the letters H and N?
H is short for hemagglutinin. And N is short for neuraminidase.
Is Flu A or B worse?
Frequently asked questions about Influenza A and B Influenza type A and type B are similar, but type A is overall more prevalent, sometimes more severe, and can cause flu epidemics and pandemics.
Why is h1n1 called h1n1?
H1N1 flu is also known as swine flu. It’s called swine flu because, in the past, the people who caught it had direct contact with pigs. That changed several years ago, when a new virus emerged that spread among people who hadn’t been near pigs.
Why was the 1918 flu so deadly?
The virus also killed people directly by causing massive hemorrhages and edema in the lungs. Modern analysis has shown the virus to be particularly deadly because it triggers a cytokine storm (overreaction of the body’s immune system).
Where did swine flu start?
The 2009 swine flu outbreak originated in Veracruz, Mexico. Health workers traced the virus to a pig farm in this southeastern Mexican state. A young boy who lived nearby was among the first people to contract the swine flu. He lived, but others in the area came down with the flu and died.
What is the h1 n1 virus?
2009 H1N1 (sometimes called “swine flu”) is a new influenza virus causing illness in people. This new virus was first detected in people in the United States in April 2009. This virus is spreading from person-to-person worldwide, probably in much the same way that regular seasonal influenza viruses spread.
What is the deadliest strain of flu?
Influenza A virus subtype H5N1 (A/H5N1) is a subtype of the influenza A virus which can cause illness in humans and many other animal species….Influenza A virus subtype H5N1Virus classificationSpecies:Influenza A virusSerotype:Influenza A virus subtype H5N1Notable strains9 more rows
What does h7n9 mean?
Avian influenza AAvian influenza A(H7N9) is a subtype of influenza viruses that have been detected in birds in the past.
How is h7n9 transmitted?
A(H7N9) and A(H5N1) viruses can cause severe disease in humans, do not transmit easily from person to person, and are primarily linked to exposure to infected poultry or contaminated environments.
Is influenza positive sense?
The genomes of all influenza viruses are composed of eight single-stranded RNA segments (Figure 1). These RNAs are negative-sense molecules, meaning that they must be copied into positive-sense molecules in order to direct the production of proteins. There are three basic types of influenza viruses: A, B, and C.
What does h5n1 stand for?
Acronym. Definition. H5N1. Hemagglutinin Type 5 and Neuraminidase Type 1 (Avian Influenza A)
What is the deadliest illness?
The deadliest disease in the world is coronary artery disease (CAD). Also called ischemic heart disease, CAD occurs when the blood vessels that supply blood to the heart become narrowed. Untreated CAD can lead to chest pain, heart failure, and arrhythmias.
Which cell organelle does the virus inject its DNA into?
Lytic cycle Attachment: Proteins in the “tail” of the phage bind to a specific receptor (in this case, a sugar transporter) on the surface of the bacterial cell. Entry: The phage injects its double-stranded DNA genome into the cytoplasm of the bacterium.
What is H and N in virus?
Influenza A viruses are classified by subtypes based on the properties of their hemagglutinin (H) and neuraminidase (N) surface proteins. There are 18 different HA subtypes and 11 different NA subtypes. Subtypes are named by combining the H and N numbers – e.g., A(H1N1), A(H3N2).
WHO h5n1 human cases?
More than 700 human infections with Asian HPAI H5N1 viruses have been reported to WHO from primarily 15 countries in Asia, Africa, the Pacific, Europe and the Near East since November 2003. Indonesia, Vietnam and Egypt have reported the highest number of human HPAI Asian H5N1 cases to date.
What is the difference between h5n1 and h7n9?
Vectors of disease differ Influenza A(H5N1) is a high pathogenicity strain for poultry, meaning that many poultry become ill and many die. Therefore, outbreaks in poultry rapidly become apparent. In contrast, A(H7N9) is a low pathogenicity strain and poultry do not become sick.
How long is person with flu contagious?
People with flu are most contagious in the first three to four days after their illness begins. Most healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick.
What are the symptoms of influenza A or B?
Flu Symptomsfever* or feeling feverish/chills.cough.sore throat.runny or stuffy nose.muscle or body aches.headaches.fatigue (tiredness)some people may have vomiting and diarrhea, though this is more common in children than adults.