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The full blood count (FBC) test looks for abnormalities in the blood, such as unusually high or low numbers of blood cells.

There are different types of breast cancer, and around 70 per cent are sensitive to the female sex hormone oestrogen.

The immune system remembers every germ it has ever overcome.

The heart, blood and blood vessels work together to service the cells of the body.

Surgically removing a diseased or damaged spleen is possible without causing any serious harm to the person.

Many bacterial infections can be treated with antibiotics, but they are useless against viral infections.

In children, the genetic changes that cause cancer are not due to lifestyle but are more likely to be random and difficult to predict.

Donated blood is screened for blood-borne diseases such as hepatitis, syphilis and HIV.

Children inherit physical characteristics such as eye colour from their parents through their genes.

Any conditions that cause a rapid breakdown of blood cells can place great strain on the spleen and make it enlarge.