What are the shapes of viruses?
What are the shapes of viruses?
Shapes of viruses are predominantly of two kinds: rods, or filaments, so called because of the linear array of the nucleic acid and the protein subunits; and spheres, which are actually 20-sided (icosahedral) polygons. Most plant viruses are small and are either filaments or polygons, as are many bacterial viruses.
What’s the basic structure of a virus?
The simplest virions consist of two basic components: nucleic acid (single- or double-stranded RNA or DNA) and a protein coat, the capsid, which functions as a shell to protect the viral genome from nucleases and which during infection attaches the virion to specific receptors exposed on the prospective host cell.
How do you avoid getting the flu when your family has it?
By practicing a few simple rules at home, you can help keep your family healthy and prevent the flu from spreading.
- Get vaccinated.
- Cover coughs and sneezes.
- Avoid touching your eyes, nose, and mouth.
- Wash your hands often.
- Limit contact with family members who are ill.
- Clean your home.
- Practice healthy habits.
Can you be genetically immune to flu?
Although genetic risk factors for influenza infection have not yet been defined in people, differences in genetic background and related variation in the response to infection, as well as viral virulence, are all likely to influence both the likelihood of infection and disease severity.
Are we immune to the Spanish flu?
The 1918 flu probably burned itself out because the weather changed, there were people who were immune, and the virus might have just attenuated and gotten more mild. Influenza changes every year because it depends on the animal host and the human host and the level of mutations.
When did the flu start?
Although there is not universal consensus regarding where the virus originated, it spread worldwide during 1918-1919. In the United States, it was first identified in military personnel in spring 1918. It is estimated that about 500 million people or one-third of the world’s population became infected with this virus.
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.