By Staff Report
Apr. 29, 2009
Here are answers from the federal agency to some questions about the illness.
What are the symptoms of swine flu in humans?
The symptoms of swine flu in people are expected to be similar to the symptoms of regular human seasonal influenza and include fever, lethargy, lack of appetite and coughing. Some people with swine flu also have reported runny nose, sore throat, nausea, vomiting and diarrhea.
What medications are available to treat swine flu infections in humans?
There are four different anti-viral drugs that are licensed for use in the U.S. for the treatment of influenza: amantadine, rimantadine, oseltamivir and zanamivir. While most swine influenza viruses have been susceptible to all four drugs, the most recent swine influenza viruses isolated from humans are resistant to amantadine and rimantadine. At this time, the CDC recommends the use of oseltamivir or zanamivir for the treatment and/or prevention of infection with swine influenza viruses.
Is there a vaccine for swine flu?
Vaccines are available to be given to pigs to prevent swine influenza. There is no vaccine to protect humans from swine flu. The seasonal influenza vaccine will likely help provide partial protection against swine H3N2, but not swine H1N1 viruses.
Over the years, different variations of swine flu viruses have emerged. At this time, there are four main influenza type A virus subtypes that have been isolated in pigs: H1N1, H1N2, H3N2 and H3N1. However, most of the recently isolated influenza viruses from pigs have been H1N1 viruses.
What are everyday actions people can take to stay healthy?
What about anti-viral drugs?
Anti-viral drugs are prescription medicines (pills, liquid or an inhaler) with activity against influenza viruses, including swine influenza viruses. Anti-viral drugs can be used to treat swine flu or to prevent infection with swine flu viruses. These medications must be prescribed by a health care professional. Influenza anti-viral drugs only work against influenza viruses; they will not help treat or prevent symptoms caused by infection from other viruses that can cause symptoms similar to the flu. There are four influenza anti-viral drugs approved for use in the United States (oseltamivir, zanamivir, amantadine and rimantadine). The swine influenza A (H1N1) viruses that have been detected in humans in the U.S. and Mexico are resistant to amantadine and rimantadine so these drugs will not work against these swine influenza viruses. Laboratory testing on these swine influenza A (H1N1) viruses so far indicate that they are susceptible (sensitive) to oseltamivir and zanamivir.
What are the benefits of anti-viral drugs?
Treatment: If you get sick, anti-viral drugs can make your illness milder and make you feel better faster. They may also prevent serious influenza complications. For treatment, anti-viral drugs work best if started as soon after getting sick as possible, and might not work if started more than 48 hours after illness starts.
Prevention: Influenza anti-viral drugs also can be used to prevent influenza when they are given to a person who is not ill, but who has been or may be near a person with swine influenza. When used to prevent the flu, anti-viral drugs are about 70 to 90 percent effective. When used for prevention, the number of days that they should be used will vary depending on a person’s particular situation.
The CDC recommends the use of oseltamivir or zanamivir for the treatment and/or prevention of infection with swine influenza viruses.
Recommendations for using anti-viral drugs for treatment or prevention of swine influenza will change as we learn more about this new virus. Clinicians should consider treating any person with confirmed or suspected swine influenza with an anti-viral drug. Visit http://www.cdc.gov/swineflu/recommendations.htm for specific recommendations.
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