It is a respiratory disease of pigs caused by type A strains of the influenza virus. It regularly causes high flu outbreaks in pigs but with low death rates.
There are four main sub-types of the virus, but the most recent isolated influenza viruses from pigs have been H1N1 viruses.
How does it spread?
Swine flu viruses do not typically infect humans though they do occur through close proximity or contact
with infected pigs or contaminated areas. Cases of human-to-human spread have been documented.
What are the symptoms?
The symptoms are similar to those of regular flu:
- Fever
- Lethargy
- Runny nose
- Cough
- Sore throat
- Lack of appetite
- Vomiting and diarrhoea in some cases.
How common is swine flu infection in humans?
In the past reports of about one human swine flu virus infection had been received every one to two years in the United States. From December 2005 till February 2009, 12 cases have been reported.
Has this strain of flu been seen before?
No. Flu mutates constantly, so it is common for new strains to emerge. Pigs can also be infected with both human and avian influenza, and the current circulating swine flu strain appears to contain genetic elements from all three.
Can swine flu be treated with antiviral drugs and flu vaccine?
The swine flu is resistant to two common drugs – Amantadine and Rimantadine. The H1N1 swine flu viruses are very different from human H1N1 viruses. Therefore, vaccines for human seasonal flu would not provide protection. However, a “seed vaccine” has been specifically tailored to this swine flu and will be manufactured if officials deem it necessary.
Can people catch swine flu by eating pork?
No. Swine influenza viruses are not transmitted by food. Eating properly handled and cooked pork and pork products is safe.
Cooking pork to an internal temperature of 70ºC and above kills the swine flu virus.
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