transported by air currents.
disease common in children; caused by the varicella-zoster virus and characterized by itchy blisters on the skin
when disease-causing germs pass from an infected person to a healthy person via direct physical contact with blood or body fluids.
harmful condition of a body part or organ.
tiny drop (as of a liquid).
(Escherichia coli) common bacteria found in the digestive system of many animals. Some strains of E. coli are dangerous to people.
(human immunodeficiency virus) virus that is a cause of AIDS (anti-immune deficiency syndrome).
when disease-causing germs pass from an infected person to a healthy person via sneezes or coughs, sending infectious droplets into the air or onto objects.
to contaminate with a disease or disease-causing organism.
contagious disease, characterized by fever, exhaustion, and difficulty breathing. Also called the flu.
inflammatory, bacteial disease that is transmitted by ticks.
infectious disease caused by a parasite carried by mosquitoes.
insect capable of piercing the skin and sucking the blood of animals.
organism that lives and feeds on another organism.
infectious, sometimes deadly, disease of the lungs.
animal that transmits a disease from one organism to another.