What should you know about modern polio?

Poliovirus can enter through the mouth and multiply in the intestine. It may pass between people through close contact or contaminated hands, food, or water. Many infections cause no obvious symptoms, but some cause fever, tiredness, headache, nausea, sore throat, or stomach upset. In a small number of cases, the virus reaches the nervous system and causes weakness or paralysis, often affecting the legs. Paralysis can interfere with breathing and swallowing and needs emergency care.

Polio is not the same as post-polio syndrome, which can cause new weakness or fatigue years after an earlier infection. A person with new neurological symptoms needs assessment rather than assuming the cause.

Check that household members, especially children, are up to date with recommended polio immunisations. Vaccines train the immune system to recognise poliovirus before exposure; a clinician can review records and explain which doses are appropriate for age, travel, or local public-health advice.

Wash hands carefully after using the toilet and before preparing food. Use safe drinking water and avoid sharing cups or utensils with someone who has a suspected infectious illness. If a clinician suspects polio, follow isolation and testing instructions while public-health teams arrange contact advice.

Seek emergency help for sudden weakness, difficulty walking, trouble swallowing, choking, or shortness of breath. Arrange prompt medical review for fever with marked neck or back stiffness, unusual drowsiness, or new limb weakness, particularly after possible exposure or travel. Do not wait for paralysis to become severe.

Ask whether your immunisation record is complete, whether travel changes your vaccine plan, and which symptoms should trigger urgent review. If weakness is present, ask what tests are needed and how breathing and swallowing will be monitored.