wrong again, dipshit.
Types of Influenza Viruses
There are four types of influenza viruses: A, B, C, and D. Influenza A and B viruses cause seasonal epidemics of disease in people (known as flu season) almost every winter in the United States. Influenza A viruses are the only influenza viruses known to cause flu pandemics (i.e., global epidemics of flu disease). A pandemic can occur when a new and different influenza A virus emerges that infects people, has the ability to spread efficiently among people, and against which people have little or no immunity. Influenza C virus infections generally cause mild illness and are not thought to cause human epidemics. Influenza D viruses primarily affect cattle with spillover to other animals but are not known to infect people to cause illness.
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). While more than 130 influenza A subtype combinations have been identified in nature, primarily from wild birds, there are potentially many more influenza A subtype combinations given the propensity for virus “reassortment.” Reassortment is a process by which influenza viruses swap gene segments. Reassortment can occur when two influenza viruses infect a host at the same time and swap genetic information. Current subtypes of influenza A viruses that routinely circulate in people include A(H1N1) and A(H3N2). Influenza A subtypes can be further broken down into different genetic “clades” and “sub-clades.” See the “Influenza Viruses” graphic below for a visual depiction of these classifications.
Clades and sub-clades can be alternatively called “groups” and “sub-groups,” respectively. An influenza clade or group is a further subdivision of influenza viruses (beyond subtypes or lineages) based on the similarity of their HA gene sequences. (See the Genome Sequencing and Genetic Characterization page for more information). Clades and subclades are shown on phylogenetic trees as groups of viruses that usually have similar genetic changes (i.e., nucleotide or amino acid changes) and have a single common ancestor represented as a node in the tree (see Figure 1). Dividing viruses into clades and subclades helps flu experts track the proportion of viruses from different clades in circulation.
Note that clades and sub-clades that are genetically different from others are not necessarily antigenically different. This is best understood by first introducing the concepts of “antigens” and “antigenic properties”. As previously described, flu viruses have hemagglutinin (H) and neuraminidase (N) surface proteins. These proteins act as antigens. Antigens are molecular structures on the surface of viruses that are recognized by the immune system and can trigger an immune response (such as antibody production). The antigenic properties are a reflection of the antibody or immune response triggered by the antigens on a particular virus. When two flu viruses are antigenically different, this means that a host’s immune response (antibodies) elicited by infection or vaccination with one of the viruses will not as easily recognize and neutralize the other virus. Therefore, for antigenically different viruses, immunity developed against one of the viruses will not necessarily protect against the other virus as well.
Conversely, when two flu viruses are antigenically similar, a host’s immune response (antibodies) elicited by infection or vaccination with one of the viruses will recognize and neutralize the other virus, thereby protecting against the other virus.
Currently circulating influenza A(H1N1) viruses are related to the pandemic 2009 H1N1 virus that emerged in the spring of 2009 and caused a flu pandemic (CDC 2009 H1N1 Flu website). These viruses, scientifically called the “A(H1N1)pdm09 virus,” and more generally called “2009 H1N1,” have continued to circulate seasonally since then and have undergone genetic changes and changes to their antigenic properties (i.e., the properties of the virus that affect immunity).
Influenza A(H3N2) viruses also change both genetically and antigenically. Influenza A(H3N2) viruses have formed many separate, genetically different clades in recent years that continue to co-circulate.
Influenza B viruses are not divided into subtypes, but instead are further classified into two lineages: B/Yamagata and B/Victoria. Similar to influenza A viruses, influenza B viruses can then be further classified into specific clades and sub-clades. Influenza B viruses generally change more slowly in terms of their genetic and antigenic properties than influenza A viruses, especially influenza A(H3N2) viruses. Influenza surveillance data from recent years shows co-circulation of influenza B viruses from both lineages in the United States and around the world. However, the proportion of influenza B viruses from each lineage that circulate can vary by geographic location and by season. In recent years, flu B/Yamagata viruses have circulated much less frequently in comparison to flu B/Victoria viruses globally.
Flogtard,
Do you know how to use a toaster?
he needs to get in the tub with hisFlogtard,
Do you know how to use a toaster?
Please provide your source that states there are currently hundreds of active flu variants."sO YoU;Re SaYyiNg ThErE aRe TwO FLuEs, A aNd b JuSt LiKe I sAyD??"
- Dr. Flogstain, ded dog dragger, walking champion, golf course trespasser, Dollah Gen'ral expert, Covid expert, shotz/vax expert, and math instructor
wrong again, dipshit.
Types of Influenza Viruses
There are four types of influenza viruses: A, B, C, and D. Influenza A and B viruses cause seasonal epidemics of disease in people (known as flu season) almost every winter in the United States. Influenza A viruses are the only influenza viruses known to cause flu pandemics (i.e., global epidemics of flu disease). A pandemic can occur when a new and different influenza A virus emerges that infects people, has the ability to spread efficiently among people, and against which people have little or no immunity. Influenza C virus infections generally cause mild illness and are not thought to cause human epidemics. Influenza D viruses primarily affect cattle with spillover to other animals but are not known to infect people to cause illness.
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). While more than 130 influenza A subtype combinations have been identified in nature, primarily from wild birds, there are potentially many more influenza A subtype combinations given the propensity for virus “reassortment.” Reassortment is a process by which influenza viruses swap gene segments. Reassortment can occur when two influenza viruses infect a host at the same time and swap genetic information. Current subtypes of influenza A viruses that routinely circulate in people include A(H1N1) and A(H3N2). Influenza A subtypes can be further broken down into different genetic “clades” and “sub-clades.” See the “Influenza Viruses” graphic below for a visual depiction of these classifications.
Clades and sub-clades can be alternatively called “groups” and “sub-groups,” respectively. An influenza clade or group is a further subdivision of influenza viruses (beyond subtypes or lineages) based on the similarity of their HA gene sequences. (See the Genome Sequencing and Genetic Characterization page for more information). Clades and subclades are shown on phylogenetic trees as groups of viruses that usually have similar genetic changes (i.e., nucleotide or amino acid changes) and have a single common ancestor represented as a node in the tree (see Figure 1). Dividing viruses into clades and subclades helps flu experts track the proportion of viruses from different clades in circulation.
Note that clades and sub-clades that are genetically different from others are not necessarily antigenically different. This is best understood by first introducing the concepts of “antigens” and “antigenic properties”. As previously described, flu viruses have hemagglutinin (H) and neuraminidase (N) surface proteins. These proteins act as antigens. Antigens are molecular structures on the surface of viruses that are recognized by the immune system and can trigger an immune response (such as antibody production). The antigenic properties are a reflection of the antibody or immune response triggered by the antigens on a particular virus. When two flu viruses are antigenically different, this means that a host’s immune response (antibodies) elicited by infection or vaccination with one of the viruses will not as easily recognize and neutralize the other virus. Therefore, for antigenically different viruses, immunity developed against one of the viruses will not necessarily protect against the other virus as well.
Conversely, when two flu viruses are antigenically similar, a host’s immune response (antibodies) elicited by infection or vaccination with one of the viruses will recognize and neutralize the other virus, thereby protecting against the other virus.
Currently circulating influenza A(H1N1) viruses are related to the pandemic 2009 H1N1 virus that emerged in the spring of 2009 and caused a flu pandemic (CDC 2009 H1N1 Flu website). These viruses, scientifically called the “A(H1N1)pdm09 virus,” and more generally called “2009 H1N1,” have continued to circulate seasonally since then and have undergone genetic changes and changes to their antigenic properties (i.e., the properties of the virus that affect immunity).
Influenza A(H3N2) viruses also change both genetically and antigenically. Influenza A(H3N2) viruses have formed many separate, genetically different clades in recent years that continue to co-circulate.
Influenza B viruses are not divided into subtypes, but instead are further classified into two lineages: B/Yamagata and B/Victoria. Similar to influenza A viruses, influenza B viruses can then be further classified into specific clades and sub-clades. Influenza B viruses generally change more slowly in terms of their genetic and antigenic properties than influenza A viruses, especially influenza A(H3N2) viruses. Influenza surveillance data from recent years shows co-circulation of influenza B viruses from both lineages in the United States and around the world. However, the proportion of influenza B viruses from each lineage that circulate can vary by geographic location and by season. In recent years, flu B/Yamagata viruses have circulated much less frequently in comparison to flu B/Victoria viruses globally.
you ******* goddamned ******* time-wasting dipshit. your dad should have pulled out.
is 2 >4 or is 4>2?
- There are 4 types of seasonal influenza viruses, types A, B, C and D. Influenza A and B viruses circulate and cause seasonal epidemics of disease.
- Influenza A viruses are further classified into subtypes according to the combinations of the hemagglutinin (HA) and the neuraminidase (NA), the proteins on the surface of the virus. Currently circulating in humans are subtype A(H1N1) and A(H3N2) influenza viruses. The A(H1N1) is also written as A(H1N1)pdm09 as it caused the pandemic in 2009 and subsequently replaced the seasonal influenza A(H1N1) virus which had circulated prior to 2009. Only influenza type A viruses are known to have caused pandemics.
- Influenza B viruses are not classified into subtypes but can be broken down into lineages. Currently circulating influenza type B viruses belong to either B/Yamagata or B/Victoria lineage.
- Influenza C virus is detected less frequently and usually causes mild infections, thus does not present public health importance.
- Influenza D viruses primarily affect cattle and are not known to infect or cause illness in people.
Keep reading, how many are CURRENTLY circulating?you ******* goddamned ******* time-wasting dipshit. your dad should have pulled out.
from your own ************* link:
is 2 >4 or is 4>2?
Thank you dipshit.
zero in my house. thus, there is no proof that the flu exists outside your bubble.hOw MaNY Is KurRinTleE SurKulAten?
Help me out here, where is the word currently in the above statement?No, the flu vaccine is only 60% effective because there are hundreds of variations of the flu, and if you are exposed to a flu not based on the flu for the vaccine you took, it won't work.
FIFYIt's utterly comical to me how the far right loons are STILL trying to push Covid Vaccine fear porn.
FIFY
17 million dead!
So the flu vaccine is ineffective because it doesn’t protect against variants that aren’t currently circulating? Dude!Help me out here, where is the word currently in the above statement?
Do explain where I stated that.Do explain how the Right is pushing Covid fear.
This ought to be an epic Floggy Matrix Move.
how many from the Holy Shot of Clots?FIFY
17 million dead!
They want people to be scared of voting in person so that they can flood the election with millions of fake mail in ballots. Again.Floggy running to grab that hand lotion again.
View attachment 12577
It's utterly comical to me how the corrupt MSM is STILL trying to push Covid fear porn.