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Influenza

Influenza, referred to as “the flu,” is a highly contagious respiratory virus. It’s most common during the winter months. It typically spreads through respiratory droplets when a person who has the flu sneezes or coughs.

Influenza A can be found in many species, including humans, birds, and pigs. Due to the breadth of potential hosts, influenza A viruses are very diverse and are capable of causing a pandemic. Influenza B and C are typically only found in humans.

 

The Native Antigen Company offer a range of mammalian expressed recombinant influenza proteins form a number of different sub-types of Influenza A, along with monoclonal antibodies that can distinguish between infection with Influenza A and B.

Influenza background

Influenza virus is a type of enveloped, segmented, negative-sense, single-stranded RNA virus of the Orthomyxoviridae family. There are three major antigenic types of influenza virus that are clinically relevant to humans. These are classified as Flu A, B and C. Flu A viruses affect humans and bird populations, whilst Flu B and C only infect humans. Flu A viruses are the most virulent human pathogens among the three influenza types and are the predominant cause of seasonal and pandemic influenza (Bouvier, NM).

Flu A viruses are further divided into subtypes based on the expression and combination of two envelope glycoproteins called haemagglutinin (H, also referred to as HA) and neuraminidase (N), which are important targets for the immune system. Flu A viruses undergo high rates of mutation and gene rearrangement which lead to antigenic variations of these glycoproteins. There are 18 H subtypes and 11 N subtypes recognised to date (CDC). The subtypes currently circulating among the human population are Flu A (H1N1) and Flu A (H3N2) (WHO).

In most healthy individuals, Flu A causes a self-limiting respiratory illness, but the virus can cause severe illness or death in the elderly and high-risk patients. Transmission of the virus from human to human is predominantly via contact with airborne droplets containing virus, from an infected individual. It can also be spread through contact with contaminated hands or surfaces.

In healthy individuals, Influenza B causes a self-limiting respiratory illness. However, Influenza B can cause severe illness and hospitalization in the young, the elderly and high-risk patients. Transmission of the virus from human to human is predominantly via contact with airborne droplets containing virus, from an infected individual. It can also be spread through contact with contaminated hands or surfaces.

Effective vaccines are available for individuals at risk of developing severe disease, but vaccinations need to be developed and administered annually due to the evolving nature of the Influenza virus. Quadrivalent vaccines, that include two subtypes of Influenza A and B, are replacing trivalent vaccines in an attempt to provide greater protection against Influenza B virus infections (WHO)

References

Bouvier, N.M. and Palese, P. (2008). The Biology of Influenza viruses. Vaccine.26(Suppl 4): D49–D53.

Center for Disease Control and Prevention: Influenza type A viruses

Wold Health Organization: Influenza (seasonal)

Influenza Antigens

We offer a range of recombinant influenza proteins that are expressed in mammalian cells, and are therefore correctly glycosylated and folded. The proteins include hemagglutinin and neuraminidase proteins from a number of different virus sub-types, enabling researchers to study the biology of viral infection with different influenza virus strains.

Influenza Antibodies

In order to assist with the differentiation of Influenza A from Influenza B, we offer monoclonal antibodies that are highly specific for each family, and additionally show no cross-reactivity with other common respiratory viruses including adenovirus and respiratory syncytial virus.

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