Note: This page contains background data about swine influenza infections in pigs. For data concerning 2009 H1N1 influenza (initially referred to as “swine flu” when it absolutely was 1st detected), visit the archived CDC 2009 H1N1 Flu website. For information about seasonal influenza, visit the CDC seasonal flu web site.
What is Swine Influenza?
Swine Influenza (swine flu) is a respiratory disease of pigs caused by type A influenza virus that frequently causes outbreaks of influenza in pigs. Swine flu viruses don’t sometimes infect humans, however rare human infections have occurred. (For more data regarding swine influenza infections in humans, see Variant Influenza Viruses in Humans). Swine flu viruses can cause high levels of illness in pig herds, but cause few deaths in pigs. Swine influenza viruses will flow into among swine all year long, however most outbreaks occur throughout the late fall and winter months almost like outbreaks in humans.
How several swine flu viruses are there?
Like influenza viruses in humans and different animals, swine flu viruses change constantly. Pigs will be infected by avian influenza and human influenza viruses and swine influenza viruses. When influenza viruses from different species infect pigs, the viruses can reassort (i.e. swap genes) and new viruses that are a mix of swine, human and/or avian influenza viruses will emerge. Over the years, completely different variations of swine flu viruses have emerged. At now, there are three main influenza An outbreak subtypes that have been isolated in pigs in the United States: H1N1, H1N2, and H3N2.
How will swine flu unfold among pigs?
Swine flu viruses are thought to be spread among pigs mostly through close contact and presumably from contaminated objects moving between infected and uninfected pigs. Infected swine herds, as well as those vaccinated against swine flu, may have sporadic disease, or might show solely delicate or no symptoms of infection.
What are signs of swine flu in pigs?
Signs of swine flu in pigs can embody fever, depression, coughing (barking), discharge from the nose or eyes, sneezing, respiratory difficulties, eye redness or inflammation, and going off feed. Some pigs infected with influenza, however, may show no signs of illness in the least.
How common is swine flu among pigs?
H1N1 and H3N2 swine flu viruses are endemic among pig populations within the United States and one thing that the business deals with routinely. Outbreaks among pigs normally occur in colder weather months (late fall and winter) , however will occur year spherical. While H1N1 swine viruses have been known to flow into among pig populations since a minimum of 1930, H3N2 influenza viruses did not begin circulating among pigs within the United States till concerning 1998. The H3N2 viruses initially were introduced into the pig population from humans. However, since then the H3N2 viruses circulating in pigs have changed. The H3N2 viruses circulating in pigs now are very totally different from the seasonal H3N2 viruses that flow into in humans.
Is there a vaccine for swine flu?
Just as there are influenza vaccines for people, there are specific swine influenza vaccines offered for pigs.