2012 – MERS-CoV Middle East Respiratory Syndrome was first found in the Arabian Peninsula in 2012 and was also associated with the coronavirus once the illness became viral.
What flu happened in 2012?
Over the course of the entire 2012–2013 season, influenza A (H3N2) viruses predominated nationally, followed by influenza B viruses; 2009 influenza A (H1N1) viruses were identified less frequently.
What are the 3 strains of flu?
Three types of flu viruses—A, B, and C—cause seasonal influenza. Influenza D may also have the potential to do so if the potential for future transmission from animals to humans comes to fruition. Seasonal flu is the type of influenza that typically causes illness for just a few months out of the year.
How many cases of flu were there in 2012?
Estimated influenza disease burden, by age group — United States, 2012-2013 influenza season
| Symptomatic Illnesses | Hospitalizations | |
|---|---|---|
| Age group | Estimate | Estimate |
| 50-64 yrs | 7,861,032 | 83,364 |
| 65+ yrs | 4,190,308 | 380,937 |
| All ages | 33,679,171 | 571,382 |
What was the last big flu pandemic?
The 1918 influenza pandemic was the most severe pandemic in recent history. It was caused by an H1N1 virus with genes of avian origin. Although there is not universal consensus regarding where the virus originated, it spread worldwide during 1918-1919.
How many strains of flu virus are there?
There are four main strains of influenza virus: A, B, C, and D. Influenza A and B viruses cause the flu season each year. Flu virus strains are always changing, and so does the yearly flu vaccine as a result.
Is quadrivalent better than trivalent?
Overall, they found that even though the quadrivalent vaccine provided better protection against the B lineage during four influenza seasons from 2013-2014 to 2016-2017, it did not protect better than the trivalent vaccine against outpatient medical visits for any influenza B illness.
