If an adult suddenly loses a litre or more of blood, they may die unless the blood in their body can be replaced. Over the years, blood transfusions have saved countless lives. Transfusions can also help patients who cannot produce enough blood cells to survive. They also help during operations when patients lose some blood.

Blood banks collect blood from donors and put it in sterile bags. It is cooled down and can be stored for up to 50 days. Laboratory workers screen blood for infectious diseases like AIDS and hepatitis. Only clean and safe blood can be given to patients.

Words

  • blood transfusion = putting blood from one person into the body of another
  • countless = so many that you cannot count them
  • donor = a person who gives blood so that others can use it
  • hepatitis = a disease of the liver that gives you fever and makes your skin yellow
  • infectious = something that can be passed on from one person to another , mostly by air
  • replace = to remove something and put something else in there instead
  • screen = here: to examine closely
  • suddenly = very quickly, surprisingly
  • sterile = completely clean; something that does not have any bacteria
  • store = to keep in a safe place
  • survive = to live on after a dangerous situation
  • unless = if not