Attention Deficit Hyperactivity Disorder (ADHD) is a behavioural disorder which affects up to one in 20 children. It is much more common in boys than girls.
Meningitis is an infection of the lining around the brain and spinal cord. Septicemia is a blood poisoning by the same germ. Both can develop very rapidly into life-threatening conditions.
Young children and infants can’t control their body temperature as well as adults, so they quite often have a raised temperature (anything higher than 38 degrees Celcius).
Head lice (Pediculus capitis) affects only humans, and cannot be passed on to, or caught from animals. Infestation with head lice is also known as pediculosis.