What should you know about polio virus comes from?

Poliovirus lives in the gut of an infected person and leaves the body in bowel movements. It can then contaminate hands, water, food, or surfaces when sanitation or handwashing is inadequate. The virus may be passed by someone with no noticeable illness, so its source is not always obvious. Less commonly, contact with saliva or respiratory secretions may contribute to spread during close contact.

After entering through the mouth, the virus can multiply in the throat and intestine. Most infections remain mild, but some can involve the nervous system and produce weakness. A person’s symptoms cannot reliably show when they became infected.

Use safe drinking water, wash hands with soap after toilet use and before eating or cooking, and clean frequently touched bathroom surfaces. Take extra care when looking after a child who has diarrhoea. Vaccination trains the immune system to recognise poliovirus before exposure and is the strongest preventive measure.

If you are unsure whether a child has received scheduled doses, ask a clinician to review the record rather than restarting doses yourself. See [Childhood Immunisation](/treatments/preventive-care-and-vaccination/childhood-immunisation/) for vaccination information.

Arrange urgent assessment for new limb weakness, difficulty standing or walking, trouble swallowing, an unusual change in voice, or breathing difficulty after possible exposure. Fever with severe headache, neck stiffness, or unusual sleepiness should also be assessed promptly. Emergency help is needed if breathing becomes laboured or swallowing is unsafe.

Ask whether recent exposure changes the need for assessment, whether household vaccination is current, and which hygiene measures matter most at home. Mention travel, shared accommodation, sanitation concerns, and any new neurological symptoms.