Carbon monoxide is a poisonous gas that has no smell or taste.
More information on Carbon Monoxide Poisoning is available here.
Hib (Haemophilus influenzae type b) is a bacterial infection that can cause a number of serious illnesses such as pneumonia or meningitis, especially in young children.
More information on Hi B is available here.
Encephalitis is an uncommon but serious condition that causes inflammation of the brain.
More information on Encephalitis is available here.
Important: If you have these symptoms, they may be unrelated to any of these conditions listed. If you are concerned about your symptoms then you should see a doctor.