Madison Clarke
Acute flaccid myelitis (AFM) is a rare but serious neurological condition that can lead to paralysis. It shares some similarities with polio, including lesions in the grey matter of the spinal cord and flaccid limb weakness. However, AFM is associated with several different viruses, particularly non-polio enteroviruses, and there is currently no specific vaccine or treatment available for it. While the polio vaccine may help reduce the risk of AFM related to the poliovirus, it is unclear whether it provides protection against AFM in general. Researchers are exploring various platforms to develop vaccines for AFM, including virus-like particles (VLPs) and the use of respiratory viruses such as the Newcastle disease virus (NDV) as vaccine vectors.
| Characteristics | Values |
|---|---|
| Similarities between polio and acute flaccid myelitis (AFM) | Both affect the spinal cord's grey matter and cause flaccid limb weakness that can result in paralysis |
| Differences between polio and AFM | Poliovirus has not been found in people diagnosed with AFM; AFM is associated with several different viruses, particularly non-polio enteroviruses such as EV-D68 and EV-A71; AFM is less common than polio |
| AFM vaccine | There is no specific vaccine or antiviral treatment available for AFM |
| Polio vaccine | There are two types of polio vaccines: inactivated polio vaccine (IPV) and oral polio vaccine (OPV) |
| Polio vaccine effectiveness | The polio vaccine is highly effective in preventing the neurologic complications of poliovirus |
| Polio vaccine protection against AFM | The polio vaccine may help reduce the risk of AFM related to the poliovirus; unvaccinated individuals who are exposed to poliovirus are at higher risk for AFM |
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What You'll Learn
- Polio vaccine may reduce the risk of AFM related to the poliovirus
- There is no cure for polio, but the polio vaccine is highly effective in preventing it
- AFM is associated with several different viruses, particularly non-polio enteroviruses
- AFM and polio share clinical and epidemiological characteristics, including lesions in the spinal cord's grey matter
- AFM is a rare but serious neurological condition that can lead to paralysis
Polio vaccine may reduce the risk of AFM related to the poliovirus
Acute flaccid myelitis (AFM) is a rare but serious neurological condition that can lead to paralysis. It shares some similarities with polio, including lesions in the grey matter of the spinal cord and flaccid limb weakness. However, AFM is associated with several different viruses, particularly non-polio enteroviruses such as EV-D68 and EV-A71.
While there is no specific vaccine or antiviral treatment available for AFM, the polio vaccine may help reduce the risk of AFM related to the poliovirus. Poliomyelitis, or polio, is caused by the poliovirus, which has three serotypes (types 1, 2, and 3). Vaccination campaigns have been highly effective in reducing and nearly eradicating polio globally. The development of the inactivated polio vaccine and oral polio vaccine has been a significant success in public health, leading to the near global eradication of the disease.
The polio vaccine prevents poliomyelitis, which is characterised by acute flaccid limb weakness and lesions in the grey matter of the spinal cord. Poliomyelitis caused by the poliovirus is rare in the United States. In 2014, the term AFM was adopted to describe poliomyelitis without a known cause and not caused by poliovirus.
While AFM and polio share some similarities, they also have key differences. Unlike polio, AFM's precise causative agent is not always identified. AFM outbreaks have occurred in areas with large numbers of EV-D68 respiratory infections, and EV-D68 circulation has been linked to AFM outbreaks globally. In addition, while both conditions can lead to long-term paralysis, the outcomes in AFM vary, with some children experiencing partial recovery.
The polio vaccine's effectiveness in preventing poliomyelitis highlights its potential benefit in reducing the risk of AFM related to the poliovirus. However, it is important to note that AFM is associated with various viruses, and the precise causative agent is not always identified. Further research and ongoing surveillance are crucial in understanding and addressing AFM.
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There is no cure for polio, but the polio vaccine is highly effective in preventing it
There is no cure for polio, but the polio vaccine has been highly effective in preventing it. Poliomyelitis, or polio, is a well-defined enterovirus with three serotypes (types 1, 2, and 3). It has been a major global health issue, causing widespread paralysis and death. The development of the polio vaccine has been one of the greatest successes in public health, leading to the near global eradication of the disease. Poliomyelitis caused by poliovirus, or polio, rarely occurs in the United States.
There are currently two types of vaccines to prevent poliomyelitis: inactivated polio vaccine (IPV) and oral polio vaccine (OPV). The IPV vaccine will provide protection against viremia and prevent the development of paralytic poliomyelitis; however, it does not break the cycle of viral transmission. On the other hand, OPV more effectively induces mucosal immunity and breaks the transmission cycle. However, in some instances, OPV viral strains may revert to a disease-causing strain, which can then be shed and circulate in the community.
Acute flaccid myelitis (AFM) is an uncommon but serious neurological condition that causes muscle weakness and sometimes leads to permanent paralysis. It is similar to polio in that they both affect the spinal cord's grey matter and cause flaccid limb weakness. However, AFM is associated with several different viruses, particularly non-polio enteroviruses such as EV-D68 and EV-A71. The precise causative agent of AFM is not always identified, and there is no specific vaccine or antiviral treatment available. While AFM and polio share some similarities, they are distinct conditions, and AFM is not caused by the poliovirus.
Although there is no cure for polio, the polio vaccine has been crucial in reducing and nearly eradicating the disease globally. The success of polio vaccination campaigns highlights the importance of ongoing surveillance, research, and public health preparedness in addressing other neurological conditions like AFM. While AFM does not yet have the same global impact as polio did at its peak, the recurring outbreaks since 2014 have raised public health concerns. The experience gained from polio eradication efforts can provide valuable insights into understanding the role of viral infections in causing neurological damage and developing preventive measures for AFM.
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AFM is associated with several different viruses, particularly non-polio enteroviruses
Acute flaccid myelitis (AFM) is a rare but serious neurological condition that primarily affects the spinal cord, leading to sudden muscle weakness and loss of reflexes. It is often associated with viral infections, particularly enteroviruses. The exact cause of AFM remains uncertain, and there is no specific vaccine or antiviral treatment available.
In 2022, a study reported the presence of EV-D68 RNA and protein in a preserved spinal cord specimen from a young child who died from AFM in 2008. Other enteroviruses and rhinoviruses, mainly EV-A71 and coxsackievirus A16, have been associated with AFM, though at lower rates. Samples taken in Colorado from 2012-2014 contained multiple polymorphisms within the ORF, some of which were similar to other neurotropic enteroviruses, poliovirus, and EV-D70 sequences. Since 2014, many other clades of EV-D68 have been linked to AFM.
Inactivated EV-A71 vaccines have been shown to be safe and effective in preventing EV-A71-associated hand, foot, and mouth disease and are approved for use in China. However, there is currently no vaccine specifically for AFM. Poliomyelitis (polio), on the other hand, is caused by the poliovirus, a well-defined enterovirus with three serotypes (types 1, 2, and 3). There are currently two types of vaccines to prevent polio: inactivated polio vaccine (IPV) and oral polio vaccine (OPV).
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AFM and polio share clinical and epidemiological characteristics, including lesions in the spinal cord's grey matter
Acute flaccid myelitis (AFM) and polio (poliomyelitis) share clinical and epidemiological characteristics, including lesions in the spinal cord's grey matter. Poliomyelitis is the term used to describe the syndrome of acute flaccid limb weakness and lesions in the grey matter of the spinal cord. Poliomyelitis is caused by the poliovirus, which is a well-defined enterovirus with three serotypes (types 1, 2, and 3).
AFM is an uncommon but serious neurological condition that causes muscle weakness and can lead to permanent paralysis. It is associated with several different viruses, particularly non-polio enteroviruses such as EV-D68 and EV-A71. The precise causative agent is not always identified, and there is currently no specific vaccine or antiviral treatment available for AFM.
Since 2014, cases of AFM have been reported in increasing numbers biennially, occurring in the late summer and early fall. While AFM outbreaks are concerning, they have not had the same global impact as polio. AFM is relatively rare compared to polio, with outbreaks occurring sporadically and at a much lower frequency. However, the recurring outbreaks of AFM have raised public health concerns, especially since there is no preventive vaccine or specific treatment available.
The similarities between AFM and polio highlight the importance of ongoing surveillance, research, and public health preparedness. The experience with polio eradication and the development of polio vaccines offer valuable lessons for addressing AFM, particularly in understanding the role of viral infections in causing neurological damage.
While polio can be prevented by a vaccine, there is currently no vaccine available for AFM. However, researchers are exploring various platforms for developing potential vaccines, including virus-like particles (VLPs) and the use of respiratory viruses that do not cause disease in humans, such as the Newcastle disease virus (NDV).
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AFM is a rare but serious neurological condition that can lead to paralysis
Acute flaccid myelitis (AFM) is a rare but serious neurological condition that can lead to paralysis. It is characterised by lesions in the grey matter of the spinal cord and flaccid limb weakness. While AFM shares some similarities with polio, it is caused by several different viruses, particularly non-polio enteroviruses such as EV-D68 and EV-A71. The precise causative agent of AFM is not always identified, and there is currently no specific vaccine or antiviral treatment available.
AFM is considered less devastating than polio due to its lower historical impact, lower rates of permanent paralysis, and reduced potential for widespread outbreaks. However, individual cases of AFM can be severe, and the recurring outbreaks since 2014 have raised public health concerns. The seasonality of NPEV circulation is linked to dewpoint temperature, while year-to-year patterns have been associated with serotype-specific immunity.
The polio vaccine may help reduce the risk of AFM related to the poliovirus. Unvaccinated individuals exposed to the poliovirus are at higher risk for AFM. While polio can be prevented by vaccination, AFM does not yet have a specific vaccine. Inactivated EV-A71 vaccines have been shown to be safe and effective in preventing EV-A71-associated diseases and are approved for use in China. However, there is currently no cure for AFM, and the long-term outlook is unknown.
Symptoms of AFM include weakness or loss of muscle tone or reflexes in the arms or legs, facial droop or weakness, difficulty moving the eyes, drooping eyelids, difficulty swallowing, and slurred speech. These symptoms can worsen rapidly, and patients may require ventilator support to breathe. If an individual suspects they have AFM, they should seek immediate medical care and be hospitalised. While AFM is uncommon, it is a serious condition that requires prompt medical attention and ongoing surveillance, research, and public health preparedness.
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Frequently asked questions
AFM is an uncommon but serious neurologic condition that causes muscle weakness, sometimes leading to permanent paralysis.
Symptoms of AFM include weakness or loss of muscle tone or reflexes in the arms or legs, facial droop or weakness, difficulty moving the eyes, drooping eyelids, difficulty swallowing, or slurred speech.
While the polio vaccine does not directly protect against AFM, it may help reduce the risk of AFM related to the poliovirus. Unvaccinated individuals exposed to the poliovirus are at higher risk of developing AFM.
There is currently no specific vaccine or antiviral treatment available for AFM.
AFM is relatively rare compared to polio, with outbreaks occurring sporadically and at a much lower frequency. Polio has been nearly eradicated globally due to effective vaccination campaigns.
