Influenza A virus subtype H2N2 (A/H2N2) is a subtype of Influenza A virus. H2N2 has mutated into various strains including the "Asian flu" strain (now extinct in the wild), H3N2, and various strains found in birds. It is also suspected of causing a human pandemic in 1889.

Feb 14, 2025 · The 1957 flu pandemic was caused by influenza H2N2 virus, to which few people had previous exposure. A vaccine was rapidly developed against H2N2, though later assessment showed that more vaccine than usual was needed to produce immunity.

The strain of virus that caused the Asian flu pandemic, influenza A virus subtype H2N2, was a recombination of avian influenza (probably from geese) and human influenza viruses. [9] [25] As it was a novel strain of the virus, the population had minimal immunity.

Jan 2, 2019 · In February 1957, a new influenza A (H2N2) virus emerged in East Asia, triggering a pandemic (“Asian Flu”). This H2N2 virus was comprised of three different genes from an H2N2 virus that originated from an avian influenza A virus, including the H2 hemagglutinin and the N2 neuraminidase genes.

Oct 4, 2016 · Within the past century, there have been four flu pandemics (worldwide epidemics.) They occurred in 1918 (H1N1 - swine flu), 1957 (H2N2), 1968 (H3N2) and 2009 (H1N1) and experts agree that it is not a matter of if, but when, the next pandemic will strike.

For five days and nights, his team tested it against blood from thousands of Americans. They found that this strain, H2N2, was unlike any flu that humans were known to have encountered.

Population immunity to H2 viruses is insufficient to block epidemic spread of H2 virus. An H2N2 pandemic would have lower impact in those born before 1968. Keywords: H2, influenza, serology, effective reproduction number, pandemic risk assessment

Jun 13, 2020 · By the time this influenza pandemic—known colloquially at the time as “Asian flu”—had concluded the following April, an estimated 20 000 people in the UK and 80 000 citizens in the USA were dead. Worldwide, the pandemic, sparked by a new H2N2 influenza subtype, would result in more than 1 million deaths.

… known as influenza A subtype H2N2. Research has indicated that this virus was a reassortant (mixed species) strain, originating from strains of avian influenza and human influenza viruses. In the 1960s the human H2N2 strain underwent a series of minor genetic modifications, a process known as antigenic drift.

H2N2 influenza A viruses caused the Asian pandemic of 1957 and then disappeared from the human population 10 years later.