- What is the oldest virus known to man?
- Are viruses living?
- Do viruses have evolution?
- Is Flu A or B worse?
- Why do viruses evolve quickly?
- Can you get the flu twice?
- What type of virus has the fastest mutation rate?
- Do viruses have DNA?
- What does h7n9 mean?
- Is Ebola an RNA virus?
- Where do Flu viruses come from?
- Is flu A virus or bacteria?
- Do viral infections go away?
- How much DNA is in a virus?
- Is flu DNA or RNA virus?
- Does influenza use RNA?
- How long are viruses contagious?
- Are all viruses RNA based?
- What class of virus is the flu?
- What is H and N flu?
- Who gets the flu most often?
- How quickly do viruses evolve?
What is the oldest virus known to man?
Smallpox and measles viruses are among the oldest that infect humans.
Having evolved from viruses that infected other animals, they first appeared in humans in Europe and North Africa thousands of years ago..
Are viruses living?
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.
Do viruses have evolution?
Viruses undergo evolution and natural selection, just like cell-based life, and most of them evolve rapidly. When two viruses infect a cell at the same time, they may swap genetic material to make new, “mixed” viruses with unique properties. For example, flu strains can arise this way.
Is Flu A or B worse?
Another key difference between influenza A and B? While influenza B viruses are typically less common than influenza A viruses, influenza B infections can be more severe in children, and can lead to complications that require hospitalization or death.
Why do viruses evolve quickly?
Viruses mutate very quickly The major reason that viruses evolve faster than say, mosquitoes or snakes or bed bugs, is because they multiply faster than other organisms. And that means every new individual is an opportunity for new mutations as they make a copy of their genetic material.
Can you get the flu twice?
The most worrisome part of a double-barreled flu season is that you can get sick twice. Just because you caught a B-strain flu doesn’t mean that you’re immune from the A strains. “There will be the rare person who gets two flu infections in the same season — one with B and one with H1N1,” Schaffner said.
What type of virus has the fastest mutation rate?
RNA viruses mutate faster than DNA viruses, single-stranded viruses mutate faster than double-strand virus, and genome size appears to correlate negatively with mutation rate.
Do viruses have DNA?
Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded. The entire infectious virus particle, called a virion, consists of the nucleic acid and an outer shell of protein. The simplest viruses contain only enough RNA or DNA to encode four proteins.
What does h7n9 mean?
Avian influenza A(H7N9) is a subtype of influenza viruses that have been detected in birds in the past. This particular A(H7N9) virus had not previously been seen in either animals or people until it was found in March 2013 in China. However, since then, infections in both humans and birds have been observed.
Is Ebola an RNA virus?
Like other Filoviruses, Ebola is an enveloped, non-segmented, negative-stranded RNA virus. Ebola virus particles have at their core a viral nucleocapsid composed of a helical single stranded RNA genome wrapped around viral proteins NP, VP35, VP30, and L.
Where do Flu viruses come from?
Answer: Influenza is a virus that’s spread from person to person. It originates, actually, among birds and other animals such as pigs, and new viral strains of influenza come to this country and to Europe from Southeast Asia.
Is flu A virus or bacteria?
Illnesses like influenza, or “the flu,” and upper respiratory infections (URIs) fall under the category of viral infections, while illnesses such as pneumonia, sinusitis and ear infections are considered bacterial infections.
Do viral infections go away?
Unlike bacterial infections that respond to antibiotics, viral infections are not so easy to treat. Many, like colds, run their course and your body heals on its own, but others, like HIV, do not.
How much DNA is in a virus?
Hemo is not the only protein with such an alien origin: Our DNA contains roughly 100,000 pieces of viral DNA. Altogether, they make up about 8 percent of the human genome. And scientists are only starting to figure out what this viral DNA is doing to us.
Is flu DNA or RNA virus?
Influenza A viruses are negative-sense, single-stranded, segmented RNA viruses.The several subtypes are labeled according to an H number (for the type of hemagglutinin) and an N number (for the type of neuraminidase). There are 18 different known H antigens (H1 to H18) and 11 different known N antigens (N1 to N11).
Does influenza use RNA?
Influenza viruses contain a single-stranded negative-sense RNA genome that consists of eight segments in influenza A and B viruses and seven segments in influenza C viruses6. … The influenza virus polymerase does not have inherent capping activity and it relies on host capped RNAs as cap-donors12.
How long are viruses contagious?
For colds, most individuals become contagious about a day before cold symptoms develop and remain contagious for about five to seven days. Some children may pass the flu viruses for longer than seven days (occasionally for two weeks). Colds are considered upper respiratory infections.
Are all viruses RNA based?
Viral families are grouped based on their type of nucleic acid as genetic material, DNA or RNA 6. DNA viruses contain usually double‐stranded DNA (dsDNA) and rarely single‐stranded DNA (ssDNA). These viruses replicate using DNA‐dependent DNA polymerase. RNA viruses have typically ssRNA, but may also contain dsRNA.
What class of virus is the flu?
Influenza viruses belong to the family Orthomyxoviridae and have a single-stranded segmented RNA genome. The influenza viruses are classified into types A, B, and C on the basis of their core proteins.
What is H and N flu?
Influenza A viruses are divided into subtypes based on two proteins on the surface of the virus: hemagglutinin (H) and neuraminidase (N). There are 18 different hemagglutinin subtypes and 11 different neuraminidase subtypes (H1 through H18 and N1 through N11, respectively).
Who gets the flu most often?
The same CID study found that children are most likely to get sick from flu and that people 65 and older are least likely to get sick from influenza. Median incidence values (or attack rate) by age group were 9.3% for children 0-17 years, 8.8% for adults 18-64 years, and 3.9% for adults 65 years and older.
How quickly do viruses evolve?
A new study has a frightening answer. When viruses face an obstacle to infecting the cells they normally infect, how long does it take for them to evolve to successfully invade them again? A new study has a frightening answer: just a little more than two weeks.