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Polio is a contagious viral illness that in its most severe form causes nerve injury leading to paralysis, difficulty breathing and sometimes death.
In the U.S., the last case of naturally occurring polio was in 1979. Today, despite a worldwide effort to wipe out polio, poliovirus continues to affect children and adults in parts of Asia and Africa.
The Centers for Disease Control and Prevention (CDC) advises taking precautions to protect yourself from polio if you're traveling anywhere there's a risk of polio.
Adults who have been vaccinated who plan to travel to an area where polio is occurring should receive a booster dose of inactivated poliovirus vaccine (IPV). Immunity after a booster lasts a lifetime.
Although polio can cause paralysis and death, the majority of people who are infected with the virus don't get sick and aren't aware they've been infected.
Some people who develop symptoms from the poliovirus contract a type of polio that doesn't lead to paralysis (abortive polio). This usually causes the same mild, flu-like signs and symptoms typical of other viral illnesses.
Signs and symptoms, which can last up to 10 days, include:
Back pain or stiffness
Neck pain or stiffness
Pain or stiffness in the arms or legs
Muscle weakness or tenderness
This most serious form of the disease is rare. Initial signs and symptoms of paralytic polio, such as fever and headache, often mimic those of nonparalytic polio. Within a week, however, other signs and symptoms appear, including:
Loss of reflexes
Severe muscle aches or weakness
Loose and floppy limbs (flaccid paralysis)
Post-polio syndrome is a cluster of disabling signs and symptoms that affect some people years after having polio. Common signs and symptoms include:
Progressive muscle or joint weakness and pain
Muscle wasting (atrophy)
Breathing or swallowing problems
Sleep-related breathing disorders, such as sleep apnea
Decreased tolerance of cold temperatures
When to see a doctor
Check with your doctor for polio vaccination recommendations before traveling to a part of the world where polio still occurs naturally or where oral polio vaccine (OPV) is used, such as Central and South America, Africa and Asia.
Additionally, call your doctor if:
Your child hasn't completed the vaccine series
Your child has an allergic reaction to the polio vaccine
Your child has problems other than a mild redness or soreness at the vaccine injection site
You had polio years ago and are now having unexplained weakness and fatigue
Poliovirus can be transmitted through direct contact with someone infected with the virus or, less commonly, through contaminated food and water. People carrying the poliovirus can spread the virus for weeks in their feces. People who have the virus but don't have symptoms can pass the virus to others.
Polio mainly affects children younger than 5. However, anyone who hasn't been vaccinated is at risk of developing the disease.
Paralytic polio can lead to temporary or permanent muscle paralysis, disability, bone deformities and death.
The most effective way to prevent polio is vaccination.
Most children in the United States receive four doses of inactivated poliovirus vaccine (IPV) at the following ages:
Between 6 and 18 months
Between ages 4 and 6 when children are just entering school
IPV is safe for people with weakened immune systems, although it's not certain just how protective the vaccine is in cases of severe immune deficiency. Common side effects are pain and redness at the injection site.
Allergic reaction to the vaccine
IPV can cause an allergic reaction in some people. Because the vaccine contains trace amounts of the antibiotics streptomycin, polymyxin B and neomycin, it shouldn't be given to anyone who's reacted to these medications.
Signs and symptoms of an allergic reaction usually occur within minutes to a few hours after the shot. Watch for:
Hoarseness or wheezing
Rapid heart rate
If you or your child has an allergic reaction after any shot, get medical help immediately.
In the U.S., adults aren't routinely vaccinated against polio because most are already immune, and the chances of contracting polio are minimal. However, certain adults at high risk of polio who have had a primary vaccination series with either IPV or the oral polio vaccine (OPV) should receive a single booster shot of IPV.
A single booster dose of IPV lasts a lifetime. Adults at risk include those who are traveling to parts of the world where polio still occurs or those who care for people who have polio.
If you're unvaccinated or your vaccination status is undocumented, get a series of primary polio vaccination shots — two doses of IPV at four- to eight-week intervals and a third dose six to 12 months after the second dose.
Doctors often recognize polio by symptoms, such as neck and back stiffness, abnormal reflexes, and difficulty swallowing and breathing. To confirm the diagnosis, a sample of throat secretions, stool or a colorless fluid that surrounds your brain and spinal cord (cerebrospinal fluid) is checked for poliovirus.
Because no cure for polio exists, the focus is on increasing comfort, speeding recovery and preventing complications. Supportive treatments include:
Portable ventilators to assist breathing
Moderate exercise (physical therapy) to prevent deformity and loss of muscle function
Preparing for an appointment
Call your primary care doctor if you've recently returned from travel abroad and develop symptoms similar to those that occur with polio. Here's some information to help you get ready for your visit.
What you can do
When you make your appointment, ask if there's anything you need to do in advance. Your doctor may recommend taking steps to reduce the risk of spreading a potentially contagious illness to others. Make a list of:
Your symptoms, and when they began
Information about recent exposure to possible sources of infection, including details about international trips, the countries you visited and the dates
Medical history, including other conditions for which you're being treated; medications, vitamins and supplements you take; and your vaccination history
Questions to ask your doctor
Take a family member or friend along, if possible, to help you remember the information you're given.
For polio, questions to ask your doctor include:
Do I have polio?
What are other possible causes for my symptoms?
What tests do I need?
What self-care steps can I take?
How long is a full recovery likely to take?
Am I contagious? If so, for how long?
When can I return to work or school?
Am I at risk of any long-term complications from polio?
Don't hesitate to ask other questions.
What to expect from your doctor
Your doctor is likely to ask you questions, such as:
Have your symptoms been continuous or occasional?
How severe are your symptoms?
What, if anything, seems to improve your symptoms?
What, if anything, appears to worsen your symptoms?
Have you recently been around people with symptoms similar to yours?