Infections

Infections

1. are

   • the successful colonization of a host by a microorganism
     • which can cause
       • disease
         • clues that a person is diseased and what may cause it are
           • signs
             • an objective and measurable indications of a disease detectable by a medical practitioner even if not apparent to the patient
               • such as
                 • vital signs
           • symptoms
             • a subjective feeling or experience a patient may experience , but cannot be clinically confirmed or objectively measured
               • such as
                 • nausea, loss of appetite, and pain
                   • a specific group of signs and symptoms of a particular disease is called a
                     • syndrome
                       • however some disease do not present noticeable signs or symptoms which are called
                         • asymptomatic or subclinical
         • a disease caused by a pathogen is called an
           • infectious disease
           • a pathogen can be
             • cellular
               • such as
                 • bacteria, parasites, and fungi
             • acellular
               • such as
                 • virus viroid prions