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Other strains of H1N1 are endemic in pigs (swine influenza) and in birds (avian influenza). [2] Subtypes of IAV are defined by the combination of the antigenic H and N proteins in the viral envelope; for example, "H1N1" designates an IAV subtype that has a type-1 hemagglutinin (H) protein and a type-1 neuraminidase (N) protein. [3]
It is now known that this was caused by an immunologically novel H1N1 subtype of influenza A. [43] The next pandemic took place in 1957, the "Asian flu", which was caused by a H2N2 subtype of the virus in which the genome segments coding for HA and NA appeared to have derived from avian influenza strains by reassortment, while the remainder of ...
Americans are in the throes of flu season in large swaths of the country.. Data − from traces in wastewater to hospitalizations − show higher levels of flu virus circulating in most of the U.S ...
On 17 May, the Chilean Health Minister confirmed, the first case of A(H1N1) flu in Chile, [23] the same day two more cases were confirmed. [24] On 29 May, the Chilean Health ministry confirmed the number of cases of A-H1N1 had risen to 224, [23] the same day two more cases were confirmed. [25] On 3 June Chile had its first confirmed death of ...
The term ILI can be used casually, but when used in the surveillance of influenza cases, can have a strict definition. The World Health Organization defines an illness as an ILI if the patient has a fever greater than or equal to 38 °C and a cough, which began in the last 10 days.
Morocco confirmed the first case of novel human swine flu (A/H1N1-2009) on 12 June, in an 18-year-old university student returning from Canada. [28] As of December 5, 2009, Morocco had 1,763 cases with 5 deaths.
The influenza A virus subtype H1N1 (initially known as swine influenza virus or as new flu, and also locally known as gripe A, gripe porcina, and influenza porcina) arrived in Argentina in late April 2009, through air traffic contact with endemic areas, especially Mexico and the United States.
Swine flu is usually caused by three subtypes - H1N1, H1N2 and H3N2. They occasionally infect humans, usually after direct or indirect exposure to pigs or contaminated environments.