Pathogens

A ............, carries a pathogen and transmits it to healthy cells.

He hypothesizes the germ theory, that diseases are caused by small animals

An organism that causes a disease is called

Can have one cell or more, usually occur in places that are warm and damp. Example athlete’s foot.

He finds that cleaning his surgical tools reduces patients' infections

Four conditions must be met before one can say that a certain pathogen causes a disease. These conditions are called .........................

Smaller than a bacteria, enter healthy cells, forcing them to replicate

According to ............. , diseases are caused by microorganisms

HIV is transmitted through an exchange of bodily fluids, such as during sexual intercourse or sharing of infected needles, this is a type of .......................... contact

Decided to try making healthy animals sick by injecting them with pathogens from a sick animal