The sequelae of poliomyelitis may worsen in old age, mainly related to the type of onset.
1. Asymptomatic type: it does not show symptoms and usually has no serious sequelae.
2. Tonic type: mainly manifested as fever, throat discomfort, nausea, vomiting, etc. Symptoms last for 1~3 days and can be gradually recovered, usually without sequelae.
3. Non-paralyzed type: the symptoms are heavier than those of the diplopia type, but there are usually no sequelae after recovery.
4. Paralyzed type: the type that is most likely to be aggravated by sequelae. This type is divided into prodromal, pre-paralyzed, paralyzed, recovered, and aftereffects. If recovery is not possible after 1~2 years after paralysis, or if it is not treated actively, it may enter the sequelae stage. Sequelae such as muscle atrophy, aggravation of limb paralysis, and progressive neuromuscular weakness may occur 25~35 years after infection.
If a child is detected with polio, it is recommended to treat it as soon as possible to avoid the sequelae.