What are the symptoms of polio?

Polio is a common disease that mostly affects children, which is very harmful to their health. In life, we need to know the relevant knowledge about the disease so that we can easily deal with the disease. So, what are the symptoms of polio? I hope the following introduction will be helpful to you, so that you can get rid of the trouble of polio as soon as possible.

(I) Latent infection (asymptomatic type): accounts for 90% of all infections. No symptoms appear after infection. The virus reproduces only in the digestive tract and does not produce viremia or penetrate the central nervous system. However, the virus can be isolated from the pharynx and feces, and specific neutralizing antibodies can be detected in the body.

(ii) Abortive type (mild): accounting for about 4%, the virus invades non-neural tissues throughout the body, and the clinical symptoms lack specificity. Symptoms of upper respiratory tract inflammation may appear, such as varying degrees of fever, pharyngeal discomfort, pharyngeal congestion and hyperplasia of lymphoid tissue on the posterior pharyngeal wall, swollen tonsils, etc.; gastrointestinal symptoms, nausea, vomiting, diarrhea or constipation, abdominal discomfort, etc.; flu-like symptoms, joint and muscle aches, etc., symptoms last for 1 to 3 days and recover on their own.

(III) Non-paralytic type: The polio virus invades the central nervous system and the circulating nerve fibers spread throughout the body. Symptoms of this stage may appear at the beginning of the disease, but most patients may be asymptomatic or have reduced symptoms for 1 to 6 days after the prodromal period and then enter this stage.

(IV) Paralytic type: accounts for about 1% of the infected people. It is characterized by clinical manifestations without paralysis type, plus lesions involving the gray matter of the anterior horn of the spinal cord, brain and cranial nerves, leading to muscle paralysis.

The above content is an introduction to the relevant knowledge about the symptoms of polio. Parents and friends can learn more about it. I hope it can be helpful to you. In life, we must pay close attention to the behavior of our children. If any symptoms of the disease occur, we must seek medical treatment in time and strengthen care.