chronic – adj. medical continuing for a long time; long-term

transmit – v. to cause (a virus, disease, etc.) to be given to others

blood transfusion A blood transfusion is a safe, common procedure in which blood is given to you through an intravenous (IV) line in one of your blood vessels.

contaminate – v. to make (something) dangerous, dirty, or impure by adding something harmful or undesirable to it

remarkable – adj unusual or surprising : likely to be noticed

advances – n. progress in the development or improvement of something

injection – n. the act or process of forcing a liquid medicine or drug into someone or something by using a special needle
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