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Swine Influenza/Variant Influenza Virus - What you need to know

What is Swine Influenza?

Swine influenza (swine flu) is a respiratory disease of pigs caused by type A influenza viruses. Common signs in sick pigs include fever, depression, coughing (barking), discharge from the nose or eyes, sneezing, breathing difficulties, eye redness or inflammation, and going off feed. However, influenza-infected pigs also may not appear ill or be only mildly ill. Swine influenza viruses may circulate among swine throughout the year, but most outbreaks occur during the late fall and winter months similar to outbreaks of seasonal influenza in humans.

What is a Variant Influenza virus?

When an influenza virus that normally circulates in swine (but not people) is detected in a person, it is called a “variant influenza virus.” For example, if a swine origin influenza A H3N2 virus is detected in a person, that virus will be called an “H3N2 variant” virus or “H3N2v” virus.

Can humans be infected with swine influenza viruses?

Yes. Swine flu viruses do not normally infect humans; however, sporadic human infections with influenza viruses that normally infect swine have occurred. Most commonly, human infections with variant viruses have occurred in people exposed to infected pigs (e.g., children near pigs at a fair or workers in the swine industry). In addition, there have been documented cases of multiple persons becoming sick after exposure to one or more sick pigs. Also, cases of limited person-to-person spread of variant viruses have occurred.

How common is it for humans to be infected with influenza viruses that normally infect swine?

In the past, CDC received single reports of human infection with swine influenza viruses every one to two years, but over the last few years, these cases have been detected more frequently. The increased detection and reporting of these cases could be occurring for a number of reasons, including one or more of the following factors:

  1. pandemic preparedness efforts have improved state level surveillance and laboratory capacity to detect novel viruses in the United States;
  2. in 2007, novel influenza virus infections were made domestically and internationally reportable;
  3. it’s also possible that there is a true increase in the number of these cases, possibly occurring from exposure to infected swine or through subsequent, limited human-to-human transmission.

Why are human infections with variant viruses of concern?

Swine flu viruses may be different from human influenza viruses. Thus, influenza vaccines made against human influenza viruses are generally not expected to protect people from swine flu viruses. In addition, because pigs are susceptible to avian, human and swine influenza viruses, they potentially may be infected with influenza viruses from different species (e.g., ducks and humans) at the same time. If this happens, it is possible for the genes of these viruses to mix and create a new virus. This type of major change in the influenza A viruses is known as antigenic shift. If this new virus causes illness in people and can be transmitted easily from person-to-person, an influenza pandemic can occur. This is what happened in 2009 when an influenza A H1N1 virus with swine, avian and human genes emerged in the spring of 2009 and caused the first pandemic in more than 40 years. The virus detected in the current cases is NOT the same one that caused the 2009 outbreak.

What symptoms do people have when they are infected with variant viruses?

People who have been infected with variant viruses have had symptoms similar to the symptoms of regular human seasonal influenza. These include fever, lethargy, lack of appetite and coughing. Some people also have reported runny nose, sore throat, eye irritation, nausea, vomiting and diarrhea.

How are variant influenza viruses spread?

Influenza viruses can be directly transmitted from pigs to people and from people to pigs. These infections have most commonly been reported after close proximity to infected pigs, such as in pig barns and livestock exhibits housing pigs at fairs. Infected pig cough or sneeze and droplets with influenza virus in them can spread through the air. If these droplets land in your nose or mouth, or are inhaled, you can be infected. There also is some evidence that you might get infected by touching a surface with virus on it and then touching your mouth or nose. A third way to possibly get infected is to inhale droplets or dust containing influenza virus. Scientists aren’t really sure which of these ways of spread is the most common.

Human-to-human transmission of variant flu viruses also has occurred, though this method of spread has been limited. It’s important to note that in most cases, variant flu viruses have not shown the ability to spread easily and sustainably from person to person.

How can human infections with variant influenza viruses be diagnosed?

To diagnose variant influenza A virus infection, a respiratory specimen would generally need to be collected within the first 4 to 5 days of illness (when an infected person is most likely to be shedding virus). However, some people, especially children, may shed virus longer. Since the 2009 H1N1 pandemic, state health departments have the ability to test for novel (non-human) influenza viruses. However, if a variant influenza virus is suspected, it is sent to CDC for further testing.

What medications are available to treat variant flu infections in humans?

There are three different antiviral drugs that are recommended for use in the United States for the treatment of influenza: oseltamivir, peramivir and zanamivir.

For information about seasonal influenza, visit the CDC Seasonal Influenza (Flu) website.
For more information, contact the Children's National Infection Control/Epidemiology office.